Mallofusa 10PCS 1-inch Mineral Fish Tank Bubble Release Air Stone Diffuser for Aquarium Diffuses oxygen efficiently and smoothly in your fish tank. Durable and sturdy material: Mineral, Plastic; Stone Size : 14.5 x 25mm/ 0.6" x 1"(D*L); Connector Size : 4.5 x 2.5mm/ 0.18" x 0.1"(Outer Dia*Inner Dia);Total Length : 38mm/ 1.5" Weight : 60g; Color : Blue Package Contents : 10 x Aquarium Air Stone