Evans EMAD Coated Bass Drum Batter Head - 22 inch - 019954941932
A Demonstration of the Evans EMAD Bass Batter Head - YouTube
Amazon.com: Evans EMAD System Pack, 22” (2pc) – Includes Batter Bass Drumhead and Resonant Drumhead -Externally Mounted Adjustable Damping System Allows Player to Adjust Attack and Focus Without Removing Drumhead : Everything Else
Evans 24" EMAD2 Clear Bass Drum Batter Head BD24EMAD2 - Drums Etc.