Features: brand new and high quality High-quality air stone that will create abundant of small to tiny bubbles rather than a limited number of larger bubbles. Can be easily driven by even for Nano air pumps, suitable for aquarium, fish for tank and circulation system. Increases oxygen and lowers CO2 levels. Sturdy and non toxic material is safe for your fish. Durable & washable. Remember that any air stone will need to be replaced every few months as they get clogged with dust, bacterium, and algae. Size: (About) (for W x L) 1-0.98 x 3.54 inches, 2-0.98 x 5.12 inches. Specifications: Material: Air Stone Color: White for Shell/Gray for Shell Size (Approx.): 1-90x25mm/3.54x0.98in 2-130x25mm/5.12x0.98in Weight (Approx.): 300g Package Includes: 1 Piece Air Stone Bar (2 Sizes) 1 Piece Suction Cup 1 Piece Check for Valve 1 Piece Adjusting for Valve 1 Piece 3-Way Pipe note: 1.Please allow 0-1cm 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!