The Evans Black Cordura Single Bass Drum Patches (Pair) – EQPB1 are made of extremely strong Cordura material and increase the attack and durability of your bass drum heads. Clear patches are rugged and will increase the durability of your bass drum head without affecting the sound. High temperature adhesive will not slip off after constant playing. Available for single or double pedals. Actual size is 2-1/8″ in diameter.