10x Aquarium Suction Cup Holder Sucker Pipe Clip For Air Line Water Pump Tube Heater It can fit the aquarium heater / filter tube / water pipe Diameter of Suction Cup: Approx. 4cm; The suction cup can produce enormous power and stick to glass surface firmly when getting rid of air inside completely Diameter of Suction Cup: Approx. 4cm; Clip Inner Diameter: Approx. 2.1cm Weight: Approx. 6g(each one); Color: Transparent