VIV's hand-blown Glasswares are the most favored in the aquatic world offering an outstanding elegance to any aquarium. Designed with an emphasis on functional beauty, each VIV glass piece is handmade in China by skilled glass workers. The pieces are formed from crystal clear borosilicate glass, the same material used to make high end lab equipment. Japanese glass craftsmen carefully hand finish each VIV part to the highest standards with smooth edges and attention to the smallest details. VIV's Mini CO2 Music Diffuser is suitable for small aquariums, 10 gallons and under. The hanger style diffuser does not disturb the view of smaller aquariums. The design does not require suction cups. The diameter for the ceramic disc is 10mm. Glass thickness: Less than 5mm rimless tanks Height: 110mm Important Info: All ceramic discs, tubes, or surfaces MUST soaked in water for at least 30 minutes before use. Always wet the glass tubing before inserting the silicon or rubber tubing to avoid damaging Glassware.