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. The measurement allowed error is +/- 1-3cm.