uxcell Aquarium Fish Tank Suction Cup Heater Clips Clamps Holder 33mm Dia 10pcs Black Soft plastic clear holder clip.Perfect for fish tank, aquarium and any glass surface. You can easily adjust shape and position of airline Each suction comes with one clip Holder is reliable and Looks clean, can be used for both salt water tanks and fresh water tanks Before use, please soak this air stone in the water for few hours