Free 5 silicone anti-slip strips If you feel that the writing board is sliding a bit during use, you can stick silicone anti-skid strips on the contact surface between the triangular support frame and the desk surface, and two silicone anti-skid strips on the edge line of the back of the writing board that comes into contact with the desktop, adjacent to the edge line. You can also use silicone anti slip strips anywhere you need them. Material: plastic Size:40*30cm Package Included: 2* Folding Slant Board for Writing 5*silicone anti-slip strips Notes: Due to the lighting effects and shooting angles, the color of the item and that shown in the picture might have a nuance. Due to manual measurement, there might be a tolerance in the product size.