Description The Air Stone is designed to gradually diffuse the air into the water tank and provide oxygen for the fish to breathe. If you are a fan of aquatic animals, the surroundings of your house are essential. Our air stones are made of high-class materials and are durable. Features -Color:Blue -Material:Sand, plastic - Size: 4.00X1.50X1.50cm/1.57X0.59X0.59in -Increase air circulation and oxygenate the water, which is beneficial to pet fish. -It is used to increase the oxygen in the fish tank. It is a good accessory for your fish tank. -A great way to add oxygen to your fish tank, aquarium, hydroponics and circulatory system. -The bubbles are uniform, small and dense, and the oxygenation effect is good. -Using high-grade materials, practical and durable, and long service life.Connect the air pump and put it in the water to help the air pump absorb oxygen into the water. You need to connect the air pump to have air. Packing list: 50 x Bubble Stones