Rough whetstone: Dark color side(rough grain whetstone400): For removing large chips or dents, heavy rust and imperfections, creating a razor sharp edge. Bright color side( medium grain whetstone1000): For most typical, everyday little damage, making the blade more sharp and good shape. Fine whetstone: White fine grain whetstone 3000 both sides for fine tuning and a super sharp and shining finish . Rough whetstone: Length: 7" , width: 2 5/16", thickness: 1 3/16" . Fine whetstone: Length: 7" , width: 2 5/16" , thickness: 9/16".