These are 12 PCS / 1 Dozen Knife Blades for KM Straight Cutting Machine 5" Narrow Type 

Please note the width of the knife shown in the picture, this knife can not work with the cutting machine using regular width knife.

Knife Size : 5"

These High Quality Cutting Machine Knives are made of alloy steel and come in a factory packed set of 12 pieces

These knives are available in other sizes.