Great to have on hand for gigs and rehearsals. Wing nuts are made of stainless steel, Cymbal felts are made of high quality felt. Durable long service life. Emergency Kit for Drummers - Makes a Great Stocking Stuffer! Butterfly nut size: 41*20*12mm Internal diameter of about 8mm, can be connected to the M8 screw rod Gasket size: 8*24*2mm (inner diameter * outer diameter * thickness) Casing size: 38*38*26mm The inner diameter is about 8.8mm Medium felt pad size: outer diameter 40mm, inner diameter 10mm, height about 15mm Packing size 10*10*5cm colour: black Material: stainless steel+Plastic+chemical fiber felt Package Contents: 2* cymbal sleeves with base 2-8mm * wing nuts 2- 8mm * washers 4 * cymbal felts Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing.