Fits for 5mm standard air line, widely used in aquarium work, fish tank. Features: Adopts rubber and soft plastics, have a strong adsortion, and it can be used for tank and any glass surface. Designed with clip-top to hold airline in place. It is suitable for 5mm air line tubing. Elastic support clip and clip air line, easy to install. Widely used in aquarium work, fish tank. Specifications: Color: White Material: Plastics Inner diameter: 5mm/0.2in Package size: 303030mm/1.181.181.18in Package weight: 30g/1.06oz Packing List: 1*Aquarium Suction Cup