This Fish Tank CO2 Diffuser is made of acrylic material, sturdy and practical, which is a good co2 diffuser for fish tank. Features the acrylic material, which has high durability, not easy to deform. Fine workmanship, it ensures the practicality. A acrylic tube for your fish tank. Features -Color:Transparent -Material:Acrylic -Size:20.20X3.20X0.80cm/7.94X1.26X0.31in -Inner diameter: 6mm; external diameter: 8mm -This Fish Tank CO2 Diffuser owns the and break resistance ability, very durable. - workmanship and fine details, and it is suitable for fish tank and aquarium, it is easy to install. -A good co2 diffuser connector tube for broken or worn out one, which is a acrylic tube for fish tank. -You can use co2 diffuser to build a better co2 diffuser system, very convenient and practical. -Round edges and smooth surface, safe to touch and do not hurt your hands. Package list: 3 x acrylic tube (15cm) 3 x acrylic tube (20cm)