Use this Glow Ruler when you're working on fabric projects, whether it's a sunny day or a dimly lit evening. It's great for crafters, designers, and anyone who needs to make accurate measurements on fabrics. The ruler is made of acrylic, with a size of 6 - 1/2 inches by 6 - 1/2 inches plus a glow edge (total 6 - 1/2 inches by 7 inches). It has a USB - C rechargeable battery, and you can simply press the power button to light up the ruler's lines.