Stone Thrones seat covers are removable, protective, and washable. An affordable and easy way to add some style to your drum kit! Stone Thrones round seat covers come in 2 sizes... Small Round fits a seat with a 12"-13" diameter seat top and a 2"- 4.5" seat height. Large Round fits a seat with a 15"-16" diameter seat top and a 3"- 6" seat height. This Stone Thrones drum seat cover easily slips over your drum seat top and tightens into place by sliding the cord lock up the strings until secure. Tuck the excess string under the seat. Made of 100% poly, it is machine washable on a gentle cycle, dry low heat, do not press.