The SKII is a clear, two ply bass drum head. This two ply Super-Kick version provides extra durability and a more focused sound than other.The Aquarian Super Kick II ( SKII) bass drum head fills the need of drummers who want that big and punchy, controlled bass drum sound without the use of blankets, pillows or external muffling.The two layers of 7 mil New-brite drumhead film act as one single, durable membrane thanks to Aquarian's multi-ply vacuum molding process. The patented "Floating Muffling System" is made of felt for a pre-dampened, yet natural sound. The felt moves and "breathes" with the drum head.Often imitated, never duplicated, the Super Kick II is a best seller and a favorite of those drummers, drum techs and recording engineers who want a great bass drum sound without all the extra work. Available in clear and texture coated versions.Two Plies of 7 mil thick New-brite drumhead filmVacuum molding process"Floating Muffling System"