Package Include 4 x air stone Features - Material: Silicon carbide air stone diffuser - Size: About 4x4x1.5cm - Color: Grey - Perfect accessories for better life air stone - Easy and convenient to use hydroponic air stones. - Creates water currents and dazzling underwater scenes bubble stone - Practical and durable domestic product aquarium bubble stone. - It is an important instrument to successfully keep aquatic fish for respiration process - Durable, washable and sintered by high temperature, different from other air stones - Increase oxygen levels, lower CO2 and raise pH. Goods Information bubble stone This is a hydroponic air stone which is made of silicon carbide.air stones for hydroponics Durable, washable and sintered by high temperature makes it different from other air stones.air stone diffuser It is a practical and durable domestic product to help fish farming conviniently.aquarium bubble stone It will creates bubbles in fish tank while attached to an air pump.hydroponic air stones Increase oxygen levels, lower CO2 and raise pH.air stone It is an important instrument to successfully keep aquatic fish for respiration process