uxcell Rubber Tube Shaped Aquarium Bubble Wall Airstone Air Stone Suction Cup 10" Length Green Fish tank bubble air stone, features cylinder shape, mineral stone oxygen diffuser. It is no harm for aquarium and suitable for fresh water or salt water. Material : Plastic, Rubber;Fit for Aquarium Oxygen Pipe External Dia. : 6mm/ 0. 24";Design : Tube Shaped Color : Green;Weight : 25g;Product Name : Bubble Wall Air Stone Tube;Suitable for : Fish Tank, Aquarium Package Content : 1 x Bubble Wall Air Stone Tube;Tube Size(Jointed) : 25. 4 x 1cm / 10" x 0. 39" (L*D)