Aquarian 26" Performance II clear, PF26 26" Bass Drum Head, a clear, two ply head, manufactured with Aquarian’s Vacuum Process which eliminates air bubbles and wrinkles between the two plies, the Performance II drumheads were designed for "loose" tuning to get the depth and punch with no "over-ring", this drumhead is sealed around the edge to create that really deep sound on the Bass Drum,