STARTIST Felt Stem Washers vs Bundy Buescher Top Cap Felt Washers

These are not interchangeable parts. The STARTIST washers are 1.8 cm cotton pads for trumpet, cornet and trombone stem and key work, and they are soft and thin. The A99 washers are 100% wool top cap felts sized 11/16 inch outer and 7/16 inch inner for Bundy and Buescher instruments, and they come in dozens or hundreds. Buy the STARTIST set for small stem and key felts on common brass; buy the A99 for Bundy/Buescher top caps where wool felt and the exact dimensions matter. Owners of older American horns report wool holds its thickness longer than cotton, while cotton is easier to compress into tight stem seats.

• Choose the STARTIST pack if you need a small mixed set of thin cotton stem and key washers for a trumpet, cornet or trombone and want spares on hand.
• Choose the A99 if you are servicing a Bundy or Buescher and need wool top cap felts at 11/16 inch outer and 7/16 inch inner diameter.