【Size】Height: Approximately 17.6 cm 　　　　Width: Approximately 8.5 cm 　　　　Thickness: Approximately 0.2 cm 【Material】Acrylic This is a 4mm ruler for leathercraft. It's transparent, so you can easily see the leather underneath, and it's made of acrylic, so you can use it repeatedly. A light brown protective seal is attached to the surface of the acrylic mold, so please peel it off before use.