Fiskars Rotary Ruler Combo for Fabric Cutting, 12-Inch x 12-Inch Ideal for measuring and making precise, clean cuts through fabric when cutting squares, triangles and other shapes Ergonomic handle and a 45 mm rotary blade make smooth, confident cuts through multiple layers of fabric easy Spring-activated blade only engages when in use Built-in ruler features a 12" x 12" measuring grid with highlighted numbers that are easy to see on light or dark fabric It is lifetime warranty product