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 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. Please note that the rubber may expand in the summer and contract in the winter, potentially detaching from the ends. While a regular cutter can also be used, please be aware that the blade may scratch the ruler. Effective length: approximately 44.3cm Width: approximately 7cm There may be scratches on the back of the aluminum. There are no scratches that will interfere with your work. We appreciate your understanding. Thank you. #AluminumRuler #GlassCuttingRuler #StainedGlass #Ruler #Hobby #Tools