These ultra-sharp replacement blades are made to work with the Tonic Precision Rotary Cutter. (Rotary cutter sold separate as 2059E.) Each small cutting blade measures 14mm (0.55") and is crafted from sturdy stainless steel. These blades are ideal for cutting fabric, paper and cardstock, and are easy to change out when you require a new blade in your rotary cutter. The blades come safely stored in a plastic carry case that will protect them - and you - until you need them. Two replacement blades per package.