【Safe Material】: The air stone is made of premium non-toxic mineral material, which is very safe, sturdy and durable, which can produce even and tiny bubbles and has a high oxygen dissolving rate. 【Continue to supply oxygen】: The aquarium bubble stone can keep supplying oxygen efficiently and smoothly to your fish tank. If you are an aquatic animal lover, the air stone is a must for your aquarium, pond and fish tank. your fish breathe better. 【Easy to clean】: If the aquarium air bubble stone is covered or blocked by algae and impurities, you can simply clean it with a brush, very convenient. You can use it for a long time. We suggest you clean it once. once a month to make a great effect. 【Widely Application】These air stones can be used in aquariums, ponds, aquariums, fresh water, salt water aquariums, hydroponic aquariums or in fish farms. The small and dense bubbles produced by air stones can not only provide oxygen for fish, but also create your beautiful aquarium. 【Air track size 】: 20 x 30 mm / 0.79 * 1.18 inch (D x H).Recommended air pump power: about 2.5W. Number of shipments: 10 pieces