---
product_id: 13431347
title: "Ferrite Ring Magnet, 4In Dia, Big Round Circle Ceramic Magnets with Hole, Strong Large Donut Circular Magnetic Ring Heavy Duty for DIY, Crafts Speaker Creative Hobbies Science"
brand: "aomag"
price: "HK$288"
currency: HKD
in_stock: true
reviews_count: 13
category: "Aomag"
url: https://www.desertcart.hk/products/13431347-ferrite-ring-magnet-4in-dia-big-round-circle-ceramic-magnets
store_origin: HK
region: Hong Kong
---

# 120 lbs pull force 100mm outer diameter High corrosion & demagnetization resistance Ferrite Ring Magnet, 4In Dia, Big Round Circle Ceramic Magnets with Hole, Strong Large Donut Circular Magnetic Ring Heavy Duty for DIY, Crafts Speaker Creative Hobbies Science

**Brand:** aomag
**Price:** HK$288
**Availability:** ✅ In Stock

## Summary

> 🧲 Elevate your projects with magnetic mastery—don’t get left behind!

## Quick Answers

- **What is this?** Ferrite Ring Magnet, 4In Dia, Big Round Circle Ceramic Magnets with Hole, Strong Large Donut Circular Magnetic Ring Heavy Duty for DIY, Crafts Speaker Creative Hobbies Science by aomag
- **How much does it cost?** HK$288 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/13431347-ferrite-ring-magnet-4in-dia-big-round-circle-ceramic-magnets)

## Best For

- aomag enthusiasts

## Why This Product

- Trusted aomag brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Versatile Magnetism:** Ideal for speakers, motors, sensors, classroom demos, and all your inventive hobbies.
- • **Budget-Friendly Strength:** Get premium magnetic force without the premium price tag—smart choice for pros and makers.
- • **Space-Savvy Organization:** Large donut hole design perfect for creative DIY projects and efficient tool storage.
- • **Unmatched Magnetic Power:** Grade 10 strength delivers a solid 120 lbs pull force—hold tight, no slip-ups!
- • **Precision Crafted Durability:** Ceramic build with superior corrosion and oxidation resistance for long-lasting performance.

## Overview

This 4-inch diameter ferrite ring magnet from AOMAG combines a powerful 120 lbs pull force with robust ceramic durability and corrosion resistance. Designed with a large central hole, it’s perfect for industrial, scientific, and creative applications, offering versatile use from speakers to DIY crafts—all while delivering exceptional value compared to rare earth alternatives.

## Description

desertcart.com: Ferrite Ring Magnet, 4In Dia, Big Round Circle Ceramic Magnets with Hole, Strong Large Donut Circular Magnetic Ring Heavy Duty for DIY, Crafts Speaker Creative Hobbies Science : Industrial & Scientific

Review: Perfect! - Very strong magnet and is exactly what I needed. Very well packaged and arrived in perfect condition. Thanks!
Review: Got what I wanted. Thanks. - Got what I wanted. Thanks.

## Features

- 【Strong Magnetic Performance】Ferrite Ring Magnets Large Round Magnet with Holes. Size - OD: 100mm(3.95"), ID: 60mm(2.36"), Thickness: 20mm(0.79"). With Grade 10 magnetic strength, these large magnets provide robust magnetic adhesion, ensuring they stay firmly attached to any metal surface without slipping.
- 【Strength & Durability】Large Ring Ferrite circle magnets with Hole has high demagnetization resistance, corrosion resistance and oxidation resistance. High-quality materials determine the quality of magnets. The Round Circle Magnets are highly resistant to demagnetization, corrosion, making them suitable for use in challenging environments without the need for additional protective coatings.
- 【Efficient Storage Solution】 - Use the large ring magnets to organize and secure metal tools and other items, saving space and reducing clutter in your workspace.Round Ceramic magnets made by molding process have more rounded edges than those cut by cutting, and are made of rare earth permanent magnetic materials mixed with other metal materials.
- 【Multiple Uses】These Big round magnets are widely used as classroom magnets, refrigerator magnets, industrial magnets, whiteboard magnets, motors and generators, sensors, speaker magnets, scientific magnets and DIY magnets.With the ability to meet the needs of all your magnetic projects, the magnetic ring will be a reliable tool in your daily life.
- 【ECONOMICAL】Compared with NdFeB magnets, this large ring ferrite magnets have no advantages in magnetic force, but magnets of the same size (compared with NdFeB magnets) sell for only a small part. The round circle magnets with hole will be packed by original AOMAG trademark package. Powered by AOMAG Only!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B007OXE3LI |
| Best Sellers Rank | #34,912 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #22 in Industrial Ceramic Magnets |
| Brand | AOMAG |
| Color | Black |
| Date First Available | March 25, 2012 |
| Department | unisex-adult |
| Is Discontinued By Manufacturer | No |
| Item Thickness | 20 Millimeters |
| Item Weight | 1.12 pounds |
| Item model number | 7-303578JFA |
| Manufacturer | AOMAG |
| Material | Ceramic |
| Number of Pieces | 1 |
| Product Dimensions | 3.93"L x 3.93"W x 0.78"Th |
| Pull Force | 120 Pounds |
| Shape | Round |

## Product Details

- **Brand:** AOMAG
- **Color:** Black
- **Material:** Ceramic
- **Product Dimensions:** 3.93"L x 3.93"W x 0.78"Th
- **Shape:** Round

## Images

![Ferrite Ring Magnet, 4In Dia, Big Round Circle Ceramic Magnets with Hole, Strong Large Donut Circular Magnetic Ring Heavy Duty for DIY, Crafts Speaker Creative Hobbies Science - Image 1](https://m.media-amazon.com/images/I/51J6vGD7njL.jpg)

## Questions & Answers

**Q: what is the lifting capacity of this magnet?**
A: I’m my experience between 325 - 370g.

**Q: what is the equivalent pull force?**
A: This magnet can pick up about 100 paper clips

**Q: What is the diameter of the inner hole?**
A: 2-1/4" ID

**Q: how many gauss?**
A: wasn't posted on the box

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect!
*by A***R on June 12, 2023*

Very strong magnet and is exactly what I needed. Very well packaged and arrived in perfect condition. Thanks!

### ⭐⭐⭐⭐⭐ Got what I wanted. Thanks.
*by F***S on August 23, 2025*

Got what I wanted. Thanks.

### ⭐⭐⭐⭐ 🧲
*by S***I on January 15, 2026*

Not as strong as thought to be yet holds small metal screws & such

## Frequently Bought Together

- Ferrite Ring Magnet, 4In Dia, Big Round Circle Ceramic Magnets with Hole, Strong Large Donut Circular Magnetic Ring Heavy Duty for DIY, Crafts Speaker Creative Hobbies Science
- Legrand Pass & Seymour S752WCC10 660W 250V Medium Base A26 Lampholder, Cleat Sockets, Front Wire, White (1 Count)
- Hillman 25' 18 Gauge Bare Copper Wire

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**Shop now:** [https://www.desertcart.hk/products/13431347-ferrite-ring-magnet-4in-dia-big-round-circle-ceramic-magnets](https://www.desertcart.hk/products/13431347-ferrite-ring-magnet-4in-dia-big-round-circle-ceramic-magnets)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-03-02*