Uxcell 18-Piece Fish Tank Air Pump Tube Holder Supporters Suction Cup Set, 6mm Diameter Aquarium Suction Cup; Color : Clear Material : Soft Plastic, Plastic; Fit Tubing Max. Dia : 6mm/0.24" Cup Diameter : 28mm/1.1"; Total Size : 28 x 20mm/1.1" x 0.79" (D*H) Weight : 23g Package : 18 Pcs x Aquarium Suction Cups