This is an aluminum ruler suitable for stained glass making and other similar crafts. It is easy to use, with a comfortable weight and 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. The rubber on the top can be used for tasks such as breaking glass. Although a regular cutter can also be used, please be aware that the blade will scratch the ruler. Please check the images for slight unevenness on the surface rubber, scratches on the back, and yellowing. Effective length: approximately 59.7cm Width: approximately 7cm The surface rubber expands in summer and contracts in winter. Please be aware of this. There are no scratches on the sides that would interfere with your work. We appreciate your understanding. Thank you.