This is a confectionery tool used to roll out dough for cookies, pie crusts, etc. to a uniform thickness, or to cut sponges and bread to a uniform thickness. For safety, the four corners are rounded and the edges are chamfered. Also, polishing with abrasives is not performed. You can use it more safely. Wooden rulers may warp or deform due to moisture absorption. However, because this is made of acrylic, which does not deform due to moisture absorption, it can be used for a long time. It can also be used as a tool to roll out clay to a uniform thickness when making oven-bake ceramic clay. Length: 300mm x Width: 20mm x Thickness: 3mm Due to the properties of acrylic, it may deform if it exceeds 65°C, so please be careful. Also, please handle it with care as it may break if subjected to strong impact. If the product is damaged upon arrival, we will provide a warranty. Please contact us before you rate the product. *We do not offer a warranty after the product has been rated. We cannot offer discounts on single items, but we will offer a small discount for those who wish to purchase multiple sets or sets with other sizes. ↑You can see other sizes of rulers from here, so please take a look.