1. good quality and nice surface 2. diameter :46 3. standard size 4. piston with high quality ... -50v-50,yb60,yf-1,fs-1,fs-50,yb80,y-801,fs-80,dt-100,dt-175e,dt-125e,rs-125 ... ,fjp,jog90,3kj(r47),gt-80,dt-180,dt-125lc,y-100,vr-150,v-90(mate90),bws100,kr150,trz-150 ...