Features: 1.Air Inlet: 304 stainless steel and chrome nickel stainless steel, high strength, good corrosion resistance, heat resistance, low temperature strength and mechanical properties; good hot workability such as stamping and bending, no heat treatment hardening situation. 2.Sturdy and Durable: Lgneous corundum material, high temperature resistance, corrosion resistance, high strength, vitreous luster, hardness 9. Specific gravity 3.95?4.10. The bubble stone will not break or drop powder after long term use. 3.High Dissolved Oxygen: The air bubbles made by the corundum material are more and finer. The area in contact with the water surface is larger, which effectively increases the amount of dissolved oxygen and makes the fish more cheerful. 4.High Density Holes: Fish tank bubbler adopts high density holes, the bubbles are finer, the air outlet is uniform, and the "atomization" effect is not easy to be blocked. Prevent noise and ultra high dissolved oxygen, cleaning once every 2 months is better. 5.Ultra Thin Ceramic "Heavy" Body: Aquarium bubble stone prevents displacement caused by water flux, has weight, prevents the air plate from being displaced by water flux and hits the landscaping in the fish tank, thus affecting the viewing experience. Specification: Item Type: Aquarium Air Stone Disc_x000D_ Material: Ceramic PackageList: 1 x AquariumAirStone Disc 1 x Suction Cup 1 x 3 Way Interface 1 x Throttle Valve 1 x Check Valve Note 1. Please allow some errors due to manual measurement._x000D_ 2. When the water depth is 80cm, the air pump pressure is required to up to 0.012Mpa, the best effect is 0.020?0.025Mpa, and the destructive pressure is above 0.2Mpa.