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*12mmInternal diameter of about 8mm, can be connected to the M8 screw rodGasket size: 8*24*2mm (inner diameter * outer diameter * thickness)Casing size: 38*38*26mmThe inner diameter is about 8.8mmMedium felt pad size: outer diameter 40mm, inner diameter 10mm, height about 15mmPacking size 10*10*5cmcolour: blackMaterial: stainless steel+Plastic+chemical fiber feltPackage Contents: 2* cymbal sleeves with base2-8mm * wing nuts2- 8mm * washers4 * cymbal felts Only the above package content, other products are not included.Note: Light 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.