Features:_x000D_ 1. Made from high quality sintered stone and plastic, environmentally friendly, durable and stable. _x000D_ 2. Help to dissolve more oxygen, increasing the amount of oxygen in the water. _x000D_ 3. Ideal for creating a ring of oxygenating bubbles within your aquarium._x000D_ 4. Easy to use, simply connect airline and air pump to the bubble ring, and place in the aquarium. _x000D_ 5. Ring shape design, unique and fashionable, perfect for decorating any fish tank. _x000D_ _x000D_ Specification:_x000D_ Condition:100% Brand New_x000D_ Material: plastic+Sintered stone_x000D_ Color: As Pictures Shown_x000D_ Type: 63*H15mm, 100*H12mm, 125*H18mm(optional)_x000D_ Suit Connector: 4mm standard interface_x000D_ Size: 63*H15mm: approx.6.3*1.5cm/2.5*0.6in(Diameter*Height)_x000D_ 100*H12mm: 10*1.2cm/3.9*0.5in(Diameter*Height), _x000D_ 125*H18mm: 12.5*1.8cm/4.9*0.7in(Diameter*Height)_x000D_ Weight: Approx.46g~174g/1.6oz~6.1oz _x000D_ _x000D_ _x000D_ Package list: _x000D_ 1x Round Air Stone_x000D_ _x000D_ Note:_x000D_ 1. Please allow 0~1 inch error due to manual measurement. Thanks for your understanding._x000D_ 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. 1Made from high quality sintered stone and plastic, environmentally friendly, durable and stable 2Help to dissolve more oxygen, increasing the amount of oxygen in the water 3Ideal for creating a ring of oxygenating bubbles within your aquarium 4Easy to use, simply connect airline and air pump to the bubble ring, and place in the aquarium 5Ring shape design, unique and fashionable, perfect for decorating any fish tank