Conn-Selmer brand composite cork washer is used to replace worn or missing trombone slide bumpers on many Conn, Benge, King, Holton, and Bach trombones. Fits these models and others with similar builds: Bach Omega 310, BTB310; Benge 165F, 170, 170F, 175,190F; King 2B, 2B+, 2BL, 3B, 3B+, 3BL, 4B, 50H, 52H, 56H, 66H, 606, 607F, 608F; Conn 8H, 22H, 23H, 79H, 88H, 89H, 100H, 110H 111H, 112H, all SL series slides except SL6262; Holton TR602. Rigid cork composite construction. Now sold as a single cork. If you are doing both sides of the slide, please order two.