Description: 【High Dissolved】: This Bubble Stone Aerator can release a large number of fine bubbles, increasing the contact water area, driving the cycling of water, and increasing the amount of dissolved. 【Fine Dense Bubbles】: Durable frosted material of the aquarium bubble stone with a small air outlet can release fine and dense bubbles, creating water currents. Our versatile air stone also be used for decorative air bubbles equipment. 【Universal Applications】: The Air Pump Stone bubble diffuser is made of durable Quartz Sand, with a connector to suit fish tanks, Interface diameter of 4mm air tube. (air pump and air tube are not included) 【High Quality】: The Air pump stone disc is used to increase the fish tank's hydroponics. For long term use, if the is clogged and the air bubbles are reduced, it can be cleaned and used repeatedly. 【Easy to Use】A great accessory to properly aerate a home aquarium/medium fish tank, a round surface wrapped to prevent air leakage, and flat bottom make the stone place steady without the suction cup. Specification: Material: Quartz Sand Interface Diameter: 4mm Package Includes: 1 Air Stone Disc Bubble Diffuser Note: Please allow slightly errors due to manual measurement and different monitors.