Performance II™ with Power Dot™: A clear, two 7 mil ply drumhead that features our patented Power Dot™ on top for added durability. 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 tom toms.