Uxcell Suction Cup Plastic Aquarium Tank CO2 Bubble Counter, Green Product Name : CO2 Bubble Counter; Use for : Aquarium, Fish Tank Color : Clear, Black; Material : Plastic Hole Outer Diameter : 4.8mm/0.19"; Overall Size : 28 x 38 x 68mm/1.1" x 1.5" x 2.7"(L*W*H) Suction Cup Dia. : 2.7cm/1.1"; Weight : 15g Package Contents : 1 x CO2 Bubble Counter,1 x Suction Cup