This is an aluminum ruler suitable for stained glass making and other similar crafts. It has a comfortable weight and shape that fits well in the hand, making it easy to use. 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 a regular cutter can also be used, please be aware that the blade may scratch the surface. Effective length: Approximately 31.8cm Width: Approximately 6cm ~~~~~~~~~~ There may be scratches on the aluminum parts. There are no scratches on the parts that affect the work. Thank you for your understanding. Thank you. #AluminumRuler #GlassCuttingRuler #StainedGlass #Ruler #Hobby #Tools