Narrow (5/16") damper head felt for newer upright/vertical pianos, 2 3/16" long. These are about 1/16" more narrow than the more commonly sold 3/8" wide felts usually used on full size uprights, plus the pad on the back is slightly offset vertically from center (see photos) such that when glued on most of the damper felt is "below" the damper head - giving slightly more clearance to the strike point of the hammer above. I see these used on most smaller pianos (spinets, consoles) and I've also encountered it on some 1880's-1890's uprights. Best bet is to match it up to existing felt on your piano.  These are original to some models of Baldwin vertical pianos (especially the studios) at the time Baldwin discontinued production in 2010.

Total of 34 damper felts - 14 for single string notes and 20 for bichord (two strings per note).

I've been full time in the piano repair and restoration business 30+ years and am glad to answer any questions you have about this item before or after your purchase. My contact info is included in each shipment and you can also reach me through eBay.