They are made of strong Acrylic+POM composite material that is not easy to break and can bend freely. Circuit board reflectors are professionally tested. It's lightweight, durable, colorful, highly recognizable, and requires no external power supply. Simple to operate, detect dents more effectively and clearly under full sunlight or strong light. Line reflector tool, line reflector is used to detect dents on car bodies and other metal surfaces Widely available, this tool allows you to get a better look at the area where your car's dings and dents are being repaired. It is also suitable for various metal surfaces such as cars, motorcycles, refrigerators, and washing machines. Colour:As Shown Material:Acrylic+POM Package Contents: 1 x Reflector Line Board 1 x Blue Holder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.