Measures 8 x 1 inch (D x H). Fits  3/8""(8mm) inner diameter tube.
 
NOT Suitable for Standard 3/16"" Airline Tubing.

Jetting Volume: 28 L/min, Recommend to use an air pump more than 15W to run it. Soak the stone in water for 6 hours before use.

Tiny Bubbles: 300-500 microns small bubbles add tons of oxygen to your circulation system, fish tank, hydroponic, aquarium, ponds and etc.

Eco-Friendly: Made of high quality washable and non-toxic carborundum material. Helps keep your roots healthy and promote exceptional growth.

No More Floating: Weighs 3 pounds and comes with 3 easy-mount suction cups to make it easily suck to the bottom of the tank."