Features: 1. Silicone material, durable. 2.Good suction, can be used for aquarium and any glass surface. 3. Easy to install/ uninstall. 4.These suction cups allow air line to be fastened to the back/ bottom of the aquarium, providing a tidier display aquarium. 5.These suction cups can also be used for many other purposes in the aquarium. 6.You can adjust air line length and shape according to your demand with this suction cups. Specification: Condition: 100% Brand New Material: Silicone Color:Black Suitable for: Aquarium Fish Tank Pump Package included: 10Pcsx Black Suckers Notice: Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures.