Evans EMAD Heavyweight Clear Bass Drum Head, 20 Inch Description View largerThe EMAD DesignThe EMAD series bass drum head is named for the externally mounted adjustable damping system. This system allows each player to control the attack and focus of the drum head by choosing one of two removable foam damping rings. Choosing the thinner foam ring allows for punch and focus without sacrificing resonance, while choosing the wider foam ring maximizes the low end and attack of any bass drum. The EMAD system is available in a variety of options including single and two ply, and clear and coated versions to accommodate each drummer’s preferences.Level 360 InnovationEvans is now offering the EMAD series of bass heads with its revolutionary Level 360 technology. With Level 360, Evans has made it easier to tune and get a wider tonal range from your drums than ever before. Applying this new collar shape to our EMAD bass drum head allows it to seat itself properly and in turn provides a head that is easy to tune and a sound that is studio ready.EMAD OptionsThe EMAD line is comprised of a variety of options with varying thicknesses, plies, and coatings. The original EMAD is comprised of a single 10 mil ply and is available in clear, coated, and the Evans Onyx choices. The EMAD2 is made up of a 6.5 mil ply and a 10 mil ply for added durability and is available in a clear option. The GMAD series takes the single ply construction of the EMAD and adds extra strength by using a 12 mil ply. The Evans EMAD Heavyweight rounds out the line with 2 clear high- performance 10 mil plies. The EMAD Heavyweight is designed to withstand heavy hitting and provide maximum attack. EMAD FeaturesAdjustable damping caters to all bass drum tonesRevolutionary Evans Level 360 collarTwo different foam damping ring options for different sound optionsMultiple sizes, thicknesses, and coatingsAvailable in sizes 18” to 26” Features: 20" drum head made using two identical plies of 10mil film Externally Mounted Adjustable Damping system allows the player to adjust attack and focus Very versatile head for all music genres; a true working drummer"s choice All Evans drum heads are designed, engineered and manufactured in the USA Product Details: Color: 20 Inch Clear Size: 20 Inch Brand: Evans Shape: Round Number of Pieces: 1 Mounting Type: Externally Mount Age Range (Description): All Age Groups Color: 20 Inch Clear Size: 20 Inch Brand: Evans Shape: Round Number of Pieces: 1 Mounting Type: Externally Mount Age Range (Description): All Age Groups Item Weight: 1.95 pounds Product Dimensions: 23.5 x 1.5 x 22.75 inches Country of Origin: USA Item model number: BD20EMADHW Is Discontinued By Manufacturer: No Date First Available: December 2, 2013 Color Name: 20 Inch Clear