4" Diameter Satin Finish Buffs Use dry to produce a satin finish on gold, silver, and other metals. Plastic center provides firm grip on tapered spindle. Sold individually. 4" diameter. Synthetic fiber buffs are 2 or 3 ply. Following sizes are available: fine grade (2 ply), fine grade (3 ply), medium grade (2 ply), medium grade (3 ply), coarse grade (2 ply), coarse grade (3 ply).