11 DRUM HEAD WITH TWO PLIES OF 10MIL FILM WITH A 2.25 PATCH BETWEEN. BRIGHT, PENETRATING SLAP TONE WITH A FULL, ROUND LOW-END. BRIGHT, PENETRATING SLAP TONE WITH A FULL, ROUND LOW-END. ETCHED TEXTURE SIMULATES THE FEEL OF ANIMAL SKIN WHILE AVOIDING THE PROBLEMS ASSOCIATED WITH NATURAL SKIN HEADS. TRI-CENTER MINIMIZES OVERTONES AND ADDS WEIGHT TO THE CENTER TO ENHANCE THE FUNDAMENTAL TONE. ALL EVANS DRUM HEADS ARE DESIGNED, ENGINEERED AND MANUFACTURED IN THE USA.