Buna type rubber material for use as a bumper stop on rotary and other rotor type valves. As used by brass repair shops. Cut to size with a sharp razor blade for a perfect fit on your horn. Round stock with allided flat side (Omega shaped) as used on Bach, Olds and other instruments. Measures approximately 1 foot (30.5cm) in length. Enough material to make approximately 48 to 64 bumpers.