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.

ASIN	B00FLXNKJE
Best Sellers Rank	#9,408 in Musical Instruments ( See Top 100 in Musical Instruments ) #7 in Woodwind Mouthpieces
Brand	D'Addario
Brand Name	D'Addario
Colour	Black
Country of Origin	USA
Customer Reviews	4.7 out of 5 stars 2,763 Reviews
Finish Type	Painted
Global Trade Identification Number	00046716580894
Importer Contact Information	Gretex Audiotech LLP
Included Components	Mouthpiece
Instrument Key	C
Item Dimensions	19.1 x 5.1 x 0.3 Centimeters
Item Type Name	Mouthpieces
Item Weight	0.09 Pounds
Manufacturer	D'Addario &Co. Inc, D'addario & Co.
Manufacturer Contact Information	D'addario & Co.
Manufacturer Part Number	RMP01B
Material	Kunststoff
Material Type	Kunststoff
Model Name	Reserve Bissgummi
Model Number	RMP01B
Packer Contact Information	Dexter Ventures Pvt. Ltd
Style	Modern
UPC	046716580894
Warranty Description	Only manufacturer defective

D’Addario Reserve Mouthpiece Patches, [Black] 5-Pack

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