DescriptionThis practical air bubble stone is made of premium silicon carbide material, which is durable and practical with long service time. It is a great way to add oxygen to your mini aquarium, fish tank, hydroponic and circulation system. Great for fish tank and aquarium use. It will be the good choice for you.Features-Color: Assorted Color. -Material: silicon carbide. -Size: About 10.00X5.00X5.00cm/3.93X1.97X1.97inch. -The style air stone release air bubble smaller, denser, more uniform, help fish swim happily in aquarium, fish tank. -Produce fine air bubble that increase oxygen levels and circulate nutrition. -If the oxygen reduces, just clean these air stones, and they can be easily washed for re-use. -Help keep fish healthy, and promote plant growth, very practical. -Air stone is for aquarium tank, hydroponic, or fish tank use.