"Round Sound"-BFSD Round Sound cuts down the overtone and ring on Snares and Toms. 10mil with our patented thumb grip for easy removal. Round Sounds available in 6" 8" 10" 12" 13" 14" 16" 18"Instantly Transform The Sound Of Your Drums…Individual Sizes - Round Sounds - 6” 8” 10” 12” 13” 14” 15" 16” 18”Jazz - Round Sound Pack - 10” 12” 14” 16”Rock - Round Sound Pack - 12” 13” 14” 16”Toms - Round Sound Pack - 6” 8” 10” 12” 13” 14” 16”Full - Round Sound Pack - 6” 8” 10” 12” 13” 14” 15" 16” 18”BFSD is compatible with: Triple Flanged Hoops, Die Cast Hoops, Single Flanged, DW True Hoops, Die Cast Hoops, Stick Saver Hoops, Wood Hoops, S-Hoops, Vintage Hoops.