Features: Brand new and high quality High-performance oxygenation: This air stone disc provides powerful oxygenation for your aquarium, ensuring health and growth for your pets Durable stainless steel construction: Made with a high-quality stainless steel body, this air stone disc is rust-resistant Great for aquarium enthusiasts: Whether you're a beginner or experienced fish keeper, this air stone disc is perfect for maintaining a healthy and thriving environment Versatile usage scenarios: Suitable for both freshwater and saltwater aquariums, as well as hydroponic system and pond Experience the benefits of superior oxygenation: With its efficient and reliable performances, this air stone disc will help keep your pets happy and healthy Specifications: Material: Stainless Steel Base Color: As Pictures Show Size (Approx.): 38mm/58mm/78mm/98mm 38mm-38x21mm/1.50x0.83in 58mm-58x21mm/2.28x0.83in 78mm-78x21mm/3.07x0.83in 98mm-98x21mm/3.86x0.83in Weight (Approx.): 38mm-50g 58mm-55g 78mm-58g 98mm-60g Package Includes: 1 Piece Air Stone Disc (38mm/58mm/78mm/98mm) 1 Piece Oxygen Tube (4.9ft for 38mm/58mm Disc; 9.8ft for 78mm/98mm Disc) 1 Piece Suction Cup 1 Piece Check Valves 1 Piece Adjusting Valves 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. Thanks!