Perfect for small aquariums containing piping, connecting the foam and objects or the positioning of small plants. Zipped fasteners integrate perfectly into the suction cups. Diameter of the suction cup after adsorption: 2.8 cm. The length of the cleaner greenhouses: 10 cm. The flexible transparent plastic suction cup is easy to install and uninstall on the aquarium, the aquarium and any other glass surface. make sure you Keep the suction cups and the glass surface clean. Replace the old and worn suction cups in a timely manner. what you get: 20 suction cups and 40 cable fasteners.