Check the listing for details. 2x Air Sand Stone Bubble Curtain Bar Aquarium Fish Tank Aerator Oxygen Air Pump. Condition: New. Listed at 5.99 USD. Package Content: 2 x Aquarium Air stone; Size: 10 inch length,recommended air pump power: > 2.5 W; Fits for 0.16"/4mm inner diameter tube. Tips:The air stones for aquariums is an air bar, without air pump and trachea. But it needs to be used with oxygen pump and oxygen tube. Description: Widely used to increase the dissolved oxygen level in the aquarium. Air stones allow the aquarium to create beautiful walls of bubbles that not only look good, but also help aerate and circulate the water. Fit for freshwater, saltwater aquarium and hydroponic use. 1. Versatile aquarium airstone for decorative & functional air bubbles 2. Rising bubbles enhance vital aquarium aeration & water movement 3. Easy to hide or convenient placement on the gravel 4. Material : Mineral, Plastic