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. The rubber on the top can be used for tasks such as breaking glass. Please note that it may expand slightly in the summer and contract in the winter. While a regular cutter can also be used, please be aware that it may scratch the ruler. There are slight irregularities on the rubber at the arrow. Effective length: approximately 59.8 cm Width: approximately 7 cm There may be some scratches on the aluminum parts. There are no scratches that will interfere with your work. We appreciate your understanding. Thank you. #aluminum ruler #glass cutting ruler #stained glass #ruler #hobby #tools