Jardin Aquarium Fish Tank Cylinder Bubble Air Stones, 2-Piece, Blue Product name : aquarium air stone; color : blue Material: mineral stone; cylinder size: 1 8 x 4 9cm/ 0 7" x 1 9"(d*h) Tube Size: 13 x 3mm/ 0. 51" x 0. 12"(L*D) Weight : 41g Package contents : 2 x aquarium air stone