Features: 1.Made from high quality sintered stone and plastic, environmentally friendly, durable and stable 2.Help to dissolve more oxygen, increasing the amount of oxygen in the water 3.Ideal for creating a ring of oxygenating bubbles within your aquarium 4.Easy to use, simply connect airline and air pump to the bubble ring, and place in the aquarium 5.Ring shape design, unique and fashionable, perfect for decorating any fish tank Specification: Features: 1. Made from high quality sintered stone and plastic, environmentally friendly, durable and stable. 2. Help to dissolve more oxygen, increasing the amount of oxygen in the water. 3. Ideal for creating a ring of oxygenating bubbles within your aquarium. 4. Easy to use, simply connect airline and air pump to the bubble ring, and place in the aquarium. 5. Ring shape design, unique and fashionable, perfect for decorating any fish tank. Specification: Condition:100% Brand New Material: plastic+Sintered stone Color: As Pictures Shown Type: 63*H15mm, 100*H12mm, 125*H18mm(optional) Suit Connector: 4mm standard interface Size: 63*H15mm: approx.6.3*1.5cm/2.5*0.6in(Diameter*Height) 100*H12mm: 10*1.2cm/3.9*0.5in(Diameter*Height), 125*H18mm: 12.5*1.8cm/4.9*0.7in(Diameter*Height) Weight: Approx.46g~174g/1.6oz~6.1oz Package list: 1x Round Air Stone Note: 1. Please allow 0~1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.