Cricut Maker Knife Replacement Blade - Replacement blade that fits the Knife Blade Drive Housing (sold separately) for precise cuts through thicker or denser materials such as balsa, matboard, leather, craft foam, and more. Add texture and dimension to your projects. - includes x1 premium 12 mm carbide Knife Blade - For use with Cricut Maker only - Requires Knife Blade Drive Housing (sold separately) - x1 Safety Changing Cap protects fingers from blade - Requires use of Design Space software on a desktop or laptop. Qualified Knife Blade cutting materials include: - Balsa wood, up to 3/32 inch - Basswood, up to 1/16 inch - Tooling leather, up to 7 oz - Garment leather, up to 5oz - Cricut Chipboard, 2mm - Matboard, 2-ply or 4-ply - Craft foam, up to 3mm.