This is an aluminum ruler suitable for stained glass making and other crafts. It's easy to use, with a comfortable weight and shape that fits well in your 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. You can also use a regular cutter, but please be careful as it may scratch the ruler. Effective length: approximately 29cm Width: approximately 6cm I believe there are no noticeable scratches, but I apologize if I've overlooked anything. Thank you. #AluminumRuler #GlassCuttingRuler #StainedGlass #Ruler #Hobby #Tools