OLFA® STAINLESS STEEL™ blades are sharper than most other Snap-Off blades in the world, and rust-proof. This makes them perfectly suitable when things can get a little wet or moist. This 9mm size is 0.38mm thick and has 13 snap segments. The plastic pack has a useful section which you can use to snap off and safely store used blade segments. Packed in boxes of 10.