This is an aluminum ruler suitable for stained glass making and other crafts. It's easy to use, with a comfortable weight and a shape that fits well in the hand. The top and sides are made of a material that allows a glass cutter to slide smoothly, while the back is made of a non-slip material that fits the glass. While you can use a regular cutter, please be aware that the blade will scratch the ruler. Effective length: approximately 27.2cm Width: approximately 6cm The surface is almost free of scratches. The back has some stains. Please be aware of this if you are concerned. There are no scratches in areas that would affect your work. Thank you for your understanding. Thank you.