100% brand new and high quality Features: Well,this bubble stone is specially designed for fish tank,which is for oxygen pump. It is effective and durable. Prevent stopping up,good for oxygen pump use. this upgraded air stone releases the bubbles more smaller, denser, uniform, which makes double oxygen dissolving rate in water Great insulativity,high purity,rust resistance,high heat resistance,stable,high intensity. Refining bubble will be a scenery for your aquarium as well. Notice: 1.After connecting with air tube,soaking into water for above 2 hours firstly,and wet stone throughly before open the air pump,in these way,bubble effect will be the best. 2.If worse effect after long time use,please pick the stone out and clean it to use. Specification: Material: Stone,Plastic Type: Clarifying Device Color: White,Green Size: S,L S: Top Diameter:5cm(1.97in); Bottom Diameter: 7cm(2.76in) L: Top Diameter:10cm(3.94in); Bottom Diameter: 12.5cm(4.92in) Quantity: 1 Pc(other accessories demo in the picture are not included!) Note:1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! 3.Please note air tube and air pump are not included. Package includes: 1 pc x Bubble Stone