Nano Air Disk Stone Fish Tank Bubble Oxygen Pump Air Refiner 1. Weight: about 63 grams at a diameter of 45 mm, about 130 grams at a diameter of 50 mm, about 443 grams at a diameter of 100 mm, about 601 grams at a diameter of 150 mm, and about 1050 grams at a diameter of 200 mm. 2. Dimensions: diameter 4550100150200 mm 3. Material: ceramic sand 4. Features: unique shape, beautiful and practical, fine bubbles, large amount of bubbles, high temperature sintering, matte surface, fine and smooth, uniform air output 5. Suitable for fish tank size: diameter 45 mm for fish tanks within 50-100 cm, diameter 50 mm for fish tanks within 50-120 cm, diameter 100 mm for fish tanks within 90-180 cm, diameter 150 mm for 100-200 cm Fish tanks up to 200 mm in diameter are suitable for fish tanks up to 180-300 cm 6. Description: it needs to be connected with an oxygen pump, with check valve, converter, suction cup, 2m long 4mm trachea (45mm and 50mm without check valve, 150mm and 200mm with two suction cups)