The Full Force™ FB Single-Ply, Medium Weight Bass Drum Batter Head features an acoustically “vented” muffling ring tucked into the hoop on the underneath side of the head. The muffling ring helps control overtones and features vent holes along the perimeter that allow the ring and head to move as one. This Clear, 10mil head has a powerful attack with outstanding projection and just the right amount of tone control. Works well when you need a big open sounding kick without unruly higher frequency overtones.