This is an aluminum glass cutting ruler, suitable for various tasks such as stained glass making. It allows for smooth movement of the glass cutter. The back is made of a non-slip material. This ruler is easy to use due to its moderate weight and comfortable shape. While a regular cutter can also be used, please be aware that it may scratch the surface. Aluminum length: Approximately 24 cm Thickness: Approximately 6 cm Please note that there may be some minor scratches that I have overlooked. Thank you.