Evans Strata 1000 Reverse Dot concert bass drum head features a single ply of 19mil film with the unique Strata coating and a reverse dot for increased attack and low-end. The Strata series utilizes a unique coating that simulates the feel and warmth of sound found with calf skin heads. For over 60 years, Evans has been an innovator in drumhead manufacturing and design. As the creator of the first synthetic drumhead and other revolutionary products such as EMAD, Hydraulics, and the UV1 series, Evans drumheads are designed with the intent of solving problems for drummers. Regarded for high quality and consistency all Evans drumheads are made in the USA and feature Level 360 Technology., 36" concert drum head with a single ply of 14mil film + the 5mil Power Center patch , Full-bodied sustain and balanced attack, Strata coating offers a warmth of tone similar to that of calf skin, Lacks the papery sound quality of other synthetic concert bass heads, The reverse dot increases attack and low-end for a larger, deeper sound,