Use these replacement blades with the We R Memory Keepers craft knife (sold separately). This 3.5x4.75x0.375 inch package contains five replacement blades and one storage case. Warning: This product contains chemicals known to the state of California to cause cancer, birth defects, or other reproductive harm. Do not mouth or chew. Imported.Details: Includes 5 Metal blades with 1 caseMeasures 3.5" x 4.75" x 0.37" Craft knife replacementPrecision blade kitDIY cutting tools