1、Made of good quality acrylic material, solid, durable and wear‑resistant. U shape adding a beautiful scenery to your fish tank. 2、It is a small bubbles diffuser air stone which makes water circulate throughout the tank and the surface. 3、Heavy enough so that the air refiner can stay on the bottom and would not float around. 4、Connecting with oxygen pump, dissolve oxygen speedily into your aquarium or tank. 5、Reusable, energy saving and long life service. Features: 1. Made of good quality acrylic material, solid, durable and wear-resistant. U shape adding a beautiful scenery to your fish tank. 2. It is a small bubbles diffuser air stone which makes water circulate throughout the tank and the surface. 3. Heavy enough so that the air refiner can stay on the bottom and would not float around. 4. Connecting with oxygen pump, dissolve oxygen speedily into your aquarium or tank. 5. Reusable, energy saving and long life service. Specifications: Material: Acrylic Color: As picture shown Push Pressure: 0.015mpa（ 0.15kg/cm2）,Recommended oxygen pump parameters: 2W, output volume ≥400ml/m Optional Size: Small Cup, Large Cup Small Cup Size: Overall Length: Approx. 12 cm/ 4.72 inch; Diffuser Diameter: Approx. 2.4 cm/ 0.94 inch; Diffuser Height: Approx. 1.35cm/ 0.53 inch Large Cup Size: Overall Length: Approx. 12 cm/ 4.72 inch; Diffuser Diameter: Approx. 3.2 cm/ 1.26 inch; Diffuser Height: Approx. 1.35cm/ 0.53 inch Packing list:  1 * Aquarium Diffuser (Small Cup/Large Cup) 2 * Suction Cup 1 * Check Valve