Check the listing for details. 2pcs Aquarium oxygenation pump bubble stone air stone tortoise shaped sand head. Color: blue, Condition: New. Listed at 10.89 USD. Product parameters:Product Name: Little Turtle aerated stoneProduct color: BlueSize: 60 × 77mm (error several millimeters)Note: bubble stone must be used with oxygen pump and air tube!Product introduction:Product parameters:Product Name: Little Turtle aerated stoneProduct color: BlueSize: 60 × 77mm (error several millimeters)Note: bubble stone must be used with oxygen pump (to be purchased separately) and air tube (to be purchased separately)!Product introduction:Bubble stone - make your aquarium full of vitality!*Stomata are dense and evenly distributed.*High quality material, high temperature sintering.*Strong and durable, high quality.The smaller the bubble generated by the bubble stone, the larger the contact area with water, and the more fully the oxygen in the air can be dissolved into the water.High density pore structure, fine and uniform bubbles:The high-density pores outside the air stone are about 100 microns, which can effectively refine the oxygen and increase the oxygen content.High quality material, high temperature sintering, strong and durable:Air stone is made of high-quality white corundum, silicon carbide, Emery and silica sand mixed and sintered at 1500 ° high temperature. It is firm and durable, not easy to damage and long service life.Quantity: 2pcs