[Packing and Size] 8 inch air stones for aquarium is a great way to add oxygen to your aquarium, fish tank, hydroponic and circulation system. Standard ID airline tubing: 3/8"(8mm). NOT suitable for standard 3/16" airline tubing. Recommended air pump power: > 15 W [Strong Material] The air stones for hydroponics are made of high-quality carborundum material, which will not affect the water quality. If the product is blocked by sundries after a long time of use, the bubbles will become less. You can take the kathson air stone out and clean it, and then you can continue to use it [Increases Air Flow] This product adds oxygen and circulates nutrients to your hydroponic systems, aquariums, ponds, fish tanks, koi ponds, plants, and other systems. It will help keep fish and plants healthy and conducive to plant growth. Each air stone disc is equipped with 3 suction cups to make it easily suck in the smooth aquarium [Ornamental] When used, the fish tank air stone produces a lot of bubbles, a lot of tiny bubbles will continuously appear, the bubbles rise to the top of the tank, the water will also follow the slight shaking, which will make your aquarium look lively, this product is also a good decoration [Wide Range of Application] Aquatic air pump accessories are suitable for hydroponic system, pond and fish tank. Either fresh or salt water can be used. It makes fish healthier and promotes plant growth

Size: 8 in x 1.1 in (200 mm x 28 mm).

Jetting Volume: 28 L/min

Connector size: 0.197 in (5mm)

Inner diameter of tubing: 3/8" NOT suitable for standard 3/16" airline tubing

Bubble size: 300 - 500 microns

Max pressure: 0.012 MPa

Recommended air pump power: greater than 15W

Production process: 

Carborundum material sintered at a high temperatures of 1500 degrees Celsius 

to provide a high quality product.   Other cheaper air stones use sand in place of carborundum and 

the quality cannot be guaranteed.