30 pcs Plastic Aquarium Valve Accessories: 10 Pcs White Air Valve Connectors & 20 Pcs Gray Control ValveHealthy and non-toxic, great to use to connect 4mm aquarium tubing air line.The air valves are for fish tank aquarium use. Easy to connect hose.Help to increase oxygen and keep air fresh, create healthy environment for your fish.Material: PlasticProduct Name: Aquarium Tubing ConnectorTube Connector Dia (Approx.): 2mm x 4mm/ 0.08"x 0.16"(Inner Dia x Outer Dia)Overall Size (Approx.): 30 x 18 x 5mm / 1.2" x 0.7" x 0.2"(L x H x W)Color: WhiteProduct Name: Aquarium Air ValveHose Connector Diameter: 5mm / 0.2"Overall Size(Approx): 47 x 23mm / 1.9" x 0.9"(L*W)Color: GrayPackage Contents:10 * Aquarium Tubing Connector20 * Aquarium Air ValvesOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.