Logan Graphics FoamWerks Replacement Blades A 20 Pk-Fits the Circle Cutter Pack of 20 - Replacement blade A for sharp accurate cutting with Logan Circle Cutter For Foamwerks Circle Cutter by Logan Graphic Products Inc. FOR USE ON STANDARD FOAMBOARD ONLY and not for cutting plexi, mats, hard plastic or for use on regular mat cutters MUST USE FOAMBOARD UNDERLAYMENT WHILE CUTTING for a smooth clean cut and for proper blade maintenance Convenient 20 pack of brand new blades for your circle cutter