Feature: 1. Premium Material: CO2 diffuser's The top is made of high temperature sintered white corundum sand, which is durable, excellent air permeability, and long term use. 2. Double Suction Cup Fixation: CO2 diffuser is fixed with double suction cups, which is not easy to fall off and is strong and durable. 3. Uniform and Delicate: Aquarium CO2 diffuser bubbles are fine, high density pores, low pressure atomization, uniform air outgassing. 4. Mini Body, Transparent Design: CO2 diffuser has mini body, does not occupy the fish tank space; The whole body is transparent and can be integrated with water plants. 5. Silent Operation: CO2 diffuser has high dissolved oxygen content, avoids splashing, and has very little vibration to the water body, running below 20 decibels. Specification: Item Type: CO2 Diffuser Material: Acrylic Size: Total Length: Approx. 5cm/2.0in Height: Approx. 4cm/1.6in Diameter: Approx. 3.5cm/1.4in Trachea Diameter: Approx. 4mm/0.16in Trachea Total Height: Approx. 10cm/3.9in Suction Cup Diameter: Approx. 2.5cm/1.0in. Package List: 1 x CO2 Diffuser2 x Suction Cup Note: Please allow some error in manual measurement.