Jardin Plastic Square Base Release Bubbles Air Stone for Aquarium, 38mm by 90mm Product Name : Aquarium Air stone; Color : Gray, Black Material : Mineral Stone, Plastic; Outlet Diameter : 5mm/0.196" Stone Part Size : 38 x 90mm/1.5" x3.5" (D x L); Total Size : 14 x 5.2 x 5.2cm/5.5" x 2.04" x 2.04" (L x W x T) Weight : 219g Package Contents : 1  Aquarium Air stone