Features: These kitty window hammock suction cups adopt simple design and fine workmanship, which are not easy to fall off, convenient to install and use. When the cat window suction cup is deformed or its adsorption effect is not good, you can soak it in the hot water and it will work again. Specifications: Material: PVC plastic Color: transparent Size: approx. 8 cm/ 3.15 inch and 8.5 cm/ 3.35 inch in diameter Package includes: 8 x Replacement suction cups Notes: Manual measurement, please allow slight errors on size. The color may exist slight difference due to different screen displays.