One ply of 7.5 mil black film with a micro-clear matte coating, an internal control ring, and a 5" offset mic port give the Onyx Resonant a short sustain with a dark sound. Features: 7.5mil black film Micro-clear matte coating internal control ring Microphone Port Short sustain with a dark sound Get Your ONYX Resonant Bass Drum Head today at the guaranteed lowest price from Sam Ash Direct with our 45-day return and 60-day price protection policy.