i thought the entire purpose was to stay in motion until stopped . do they stop on their own?

yes, they will do stop on their own after 50-60 seconds

Does this thing get rusted?

No. We have had ours for a few years now and it is still in like new condition. No rust

What is the length? The title states 11" while the product descriptions specifies 9".

The length of the marble base is 9.06 inches, the width is 6.69 inches, and the diagonal length of the marble base is about 11 inches.

we had one before from a mall and the balls were tangled so we couldn't use it does this one have the balls where they don't tangle ?

The one I ordered through Amazon was packaged very carefully with each ball and string wrapped in plastic. The strings were not tangled. The unit has not tangled; the balls are heavy weight and seem to be good quality. I am sorry that you had that experience. I enjoy the cradle so much; it is intriguing.

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CERROPI Large Newtons Cradle Pendulum with 7 Balls, Physics Perpetual Motion Desk Toys for Office, Calm Down Fidgets, 50+ Sec Swingtime (Beech Base)

CERROPI Large Newtons Cradle Pendulum with 7 Balls, Physics Perpetual Motion Desk Toys for Office, Calm Down Fidgets, 50+ Sec Swingtime (Beech Base)

Product ID: 167633601

⏳50+ seconds swing time

⚙️7 precision steel balls

🛡️8mm chromed steel frame

HK$985

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Description

⚡ Elevate your desk game with perpetual motion magic!

GIFT READY ELEGANCE - Individually wrapped with shockproof foam—perfect for impressing colleagues or loved ones.
WORRY FREE WARRANTY - 1-year coverage plus replacement parts and a cleaning cloth to keep your cradle pristine.
ENDLESS SWING SERENITY - Enjoy mesmerizing 50+ seconds of smooth, stress-relieving oscillation.
SEAMLESS MOMENTUM MASTERY - Experience physics in flawless motion with 7 perfectly aligned steel balls.
BUILT TO LAST DESIGNED TO IMPRESS - Crafted from ultra-durable chromed steel and high-impact nylon for enduring elegance.

The CERROPI Newton's Cradle Pendulum features 7 chromed steel balls suspended on an 8mm steel frame, engineered for over 50 seconds of continuous swing. Designed with ultra-thin nano technology and high-impact nylon supports, it offers durable, smooth oscillation ideal for office stress relief, educational demonstrations, and stylish desk décor. Packaged with care and backed by a 1-year warranty, it’s the perfect blend of science, sophistication, and lasting quality.

Specifications

ASIN	B07Y5S5YWR
Age Range Description	Adult/Kid
Best Sellers Rank	#19,753 in Toys & Games ( See Top 100 in Toys & Games ) #192 in Educational Science Kits
Brand Name	CERROPI
Color	Silver
Customer Reviews	4.5 out of 5 stars 773 Reviews
Educational Objective	Logical Thinking
Global Trade Identification Number	00715668926103
Included Components	1PC Newtons Cradle
Indoor Outdoor Usage	Indoor
Item Dimensions	9.06 x 6.69 x 6.69 inches
Item Type Name	science-kits
Item Weight	1200 g
Manufacturer	CERROPI
Manufacturer Part Number	2057
Manufacturer Warranty Description	60 Day Warranty Against Manufacturer Defects
Manufacturer recommended age	5 years and up
Material Type	Nylon, Steel, Wood
Model Number	2057
Number of Packs	1
Number of Players	1
Operation Mode	Manual
Power Source	Manual
Set Name	Newton's Cradle with 7 Balls
Size	Large
Supported Battery Types	No batteries required
Theme	Physics
UPC	715668926103
Unit Count	1 Count

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HK$985

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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