100 pieces of felt, enough for 88 notes plus extras. Approx dimensions 1/2" outside diameter, 1/8" inside diameter, .035" thick.  Blue. These can be used (and are also sold as) hitch pin punchings; however, I like to use these as balance rail punchings.  They are excellent quality and very thin ..... thin felt will not compress as much as thick felt so I use this to help maintain long term key level.

I've been a piano technician 30+ years and am glad to answer any questions you have about this item, before or after the sale.  My contact info is included in each shipment and you can also reach me through eBay.