This CRL Single Edge Razor Blade is top quality, industrial grade, .009" (.23 mm) thick, Carbon C-1095 surgical steel, precision-honed for extra sharpness. It delivers durability along with the exacting, quality cut that professionals demand. Packed 100 each per box, there are 50 boxes per case. Each Blade is individually wrapped to protect the edge until you are ready-to-use. Also available in packs of ten, loaded in a handy, spring loaded plastic disposable pack.