12 x Aquarium Air Stone: 2*a + 10*bSuitable for: Tank, AquariumShaped: Bar DesignMaterial: Mineral, PlasticColor: Green & Blue & blueOutlet Connector Diameter: 6mm/ 0.24 inch (max.)Product Name : Aquarium Air Stone;Stone Size : 14.5 x 25mm/ 0.6 inch x 1 inch(D*L)Connector Size : 4.5 x 2.5mm/ 0.18 inch x 0.1 inch(Outer Dia*Inner Dia);Total Length : 38mm/ 1.5 inchWeight: 170gCreates bubbles in fish tank while attached to an air pumpIt is an important instrument to successfully keep aquatic fish for respiration processUsed to increase the dissolved O2 level in the aquarium.Stone Length: 20cm/ 8 inchTotal Size (Approx): 21.2 x 2.1 x 1.3cm/ 8.3 inch x 0.8 inch x 0.5 inch (L*W*T)A great way to properly aerate a home aquarium, help to keep fish healthy and adds to the beauty of the aquarium.Made of mineral material, it effectively create water currents and dazzling underwater scenes.Package Contents :12 x Aquarium Air StoneOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.