Do they fit Eb alto sax mouthpieces? What's the benefit to these?

Yes, they fit alto sax mouthpieces. The benefits to these are they both cushion teeth when playing as well as protect the mouthpiece from damage from the teeth, thus prolonging its useful life.

What is the thickness? (.4 or .8 mm etc?)

The black mouthpiece patch is 0.8mm thick and the clear mouthpiece patch is 0.35mm thick

How often should they be changed?

When the patches are worn through, then change them. Depends on your usage.

do these fit Vandoren metal mouth pieces

I have not used them on the Vandoren metal mouth piece but I suspect that it WILL fit just fine. It's slightly small on the hard rubber mouthpieces, and metal mouthpieces are usually narrower than the hard rubber, so it will probably work. They stick beautifully and it makes a huge difference in playing comfort.

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Reserve Mouthpiece Patch Black, 5-Pack

Product ID: 7903499

Details

Brand
D'Addario
Color
Black
Instrument Key
C Major
Material
Plastic
Style
Modern

🦷Prevents teeth sliding for stable play

5️⃣5 patches per pack for long-lasting use

🛡️Protects mouthpiece from wear

HK$125

Duties & taxes included

In stock

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

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Description

🎷 Play with confidence, protect with style — never compromise your sound!

ENHANCED PLAYING COMFORT - Prevent teeth from slipping and biting, promoting a secure embouchure and flawless tone every session.
EASY APPLICATION REMOVAL - Adheres firmly yet removes cleanly without residue—switch patches effortlessly to maintain peak performance.
PERFECT THICKNESS FOR CONTROL - 80mm black patches provide the ideal cushion thickness to balance comfort and precision.
ULTIMATE MOUTHPIECE PROTECTION - Shield your clarinet or saxophone mouthpiece from daily wear and tear with durable, residue-free patches.
TRUSTED BY PROFESSIONALS EDUCATORS - Backed by D’Addario’s century-long legacy, these patches support embouchure development for all skill levels.

D'Addario Reserve Mouthpiece Patch Black 5-Pack offers clarinetists and saxophonists a premium solution to protect mouthpieces, prevent teeth sliding, and enhance playing comfort. Featuring 80mm thick, residue-free patches, this pack ensures long-lasting durability and easy maintenance, backed by D’Addario’s renowned quality and innovation in woodwind accessories.

Specifications

ASIN	B00FLXNKJE
Best Sellers Rank	#246 in Musical Instruments ( See Top 100 in Musical Instruments ) #1 in Clarinet Mouthpieces
Brand Name	D'Addario
Color	Black
Customer Reviews	4.8 4.8 out of 5 stars (2,925)
Finish Type	Polished
Global Trade Identification Number	00046716580894
Included Components	Mouthpiece
Instrument Key	C Major
Item Dimensions	7.5 x 2 x 0.13 inches
Item Type Name	Woodwind Reeds Case
Item Weight	1.44 ounces
Manufacturer	D'Addario &Co. Inc
Manufacturer Part Number	RMP01B
Material Type	Plastic
Model Name	Reserve Mouthpiece Patch
Model Number	RMP01B
Set Name	5-Pack
Style	Modern
UPC	046716580894
Unit Count	5 Count
Warranty Description	Replaced if defective.

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