Visible yellow lines, perfectly helps your to find the position of the car dent. Can be fixed on the cars body with Suction cup, conveniently. Its for aligning the reflected lines of the board to a dent. It works best when there is plenty of sun light. The reflection becomes distorted where the dent is and you can then work your tool behind the dent to make the distorted image even or uniform again. Convenient when working outside with a natural light, Check the dent when youre not sure where is the dent. Easily controlled, removal the dent by yourself. Specifications: Material:Acrylic Color: As shown Size: About 31 x 21cm Package includes: 1pc x Dent Detection Board Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement.