Evans EQ Bass Patch Single EVANS AF Patch is an Aramid Fiber bass drum patch that provides unsurpassed durability and emphasizes attack characteristics. This patch contains four radial slits along the perimeter, allowing the head to vibrate naturally for better tone and feel. Read More Single Pedal version, add two for double pedals 2 patches per package Increases attack without affecting sustain or low end All EVANS accessories are designed, engineered and manufactured in the