... "(15.8mm) 7/8"(22.2mm)4. Cup color:red, blue,orange,black,zinc plated etc5. wire material:1)S:steel wire 0.35 ... .4,0.5mm3)BS:brass plated steel wire:0.3mm4)B:brass wire:0.3mm5)CS:carbon steel wire:0.3,0.35,0.5mm6)AO ... :Abrasive filaments,oxide aluminium ,80grits,120grits and etc.7)SIL ...