The Attack 20" Orbit 2Ply Black Resonant Ported Bass Drum Head is designed for drummers wanting controlled low-end with open resonant tone. It combines a single-ply feel with double-ply strength giving you a balanced response that works well on stage or in the studio. The vacuity design removes sections of the under layer helping the head breathe while keeping the low frequencies intact.Built with 10 mil black Dynaflex film this resonant head stays consistent under regular playing and holds its shape over time. The included 4" Holz port not only reinforces the mic hole but also keeps the finish looking neat and professional. It also helps you achieve more focused attack and easier microphone placement. If you want a bass drum sound thats full but still articulate this setup keeps things simple and effective.