The suction cups are made of sturdy PVC material, which is not easy to break and deform when applied has a strong bearing capacity. The vertical flagpole suction cup is a for flagpole installations. its construction ensures performance. Features -Color:Transparent -Material:PVC -Size:3.50X3.50X1.20cm/1.38X1.38X0.47in -Note: hole is about 0.5cm - Easy to install on a variety of flat surfaces: with their smooth surface, these suction cups can be easily installed on a wide range of flat surfaces. - Anti-collision suction cups are not easily affected by temperature changes and can be reused. - Transparent suckers can be firmly adsorbed on various smooth objects or walls. - The PVC suction cup is smooth surfaces such as desktop, window, car and so on. - You will have a good use experience because of the perfect workmanship of this suction cup. Package list: Suction Cups