18" DRUM HEAD WITH A THIN LAYER OF OIL BETWEEN TWO PLIES OF FILM TO SUPPRESS UNWANTED OVERTONES. TWO PLIES OFFER CONSISTENCY AND DURABILITY FOR LONGER PLAYING TIME. TWO PLIES OFFER CONSISTENCY AND DURABILITY FOR LONGER PLAYING TIME. A FAT, DEEP AND SHORT SOUND PIONEERED BY EARLY 70'S ROCK AND ROLL. ALSO AVAILABLE IN A GLASS (CLEAR) AND A BLACK VERSION. EXCLUSIVE LEVEL 360 TECHNOLOGY COLLAR DESIGN ENSURES PROPER CONTACT BETWEEN DRUM HEAD AND DRUM SHELL.