Uxcell 5 Piece Plastic Aquarium Airstone Diffuser Air Tube Color: Random; Package Content: 5 x Aquarium Airstone; Stone Size: 15 x 42mm / 0.6" x 1.7"(D*H) Total Size: 9 x 9 x 4; Material: Plastic,Mineral; Net Weight: 44g; Model: NAJ-045 Made of mineral material, it effectively create water currents and dazzling underwater scenes. Creates bubbles in fish tank while attached to an air pump(Not Included). An ideal tool to add oxygen to your hydroponic growing system.