uxcell 5.2" Dia Dark Gray Plastic Frame Mineral Aquarium Bubbles Air Stone Hydroponics Product Name : Aquarium Bubbles Air Stone;Suitable for : Fish Tank, Aquarium Material : Mineral, Plastic;Total Size(Approx.) : 13.1 x 1.9cm / 5.2" x 0.75"(D*H) Stick Size : 3.7 x 1.7cm/ 1.5" x 0.67"(L*W);Import Dia(Approx.) : 5mm/ 0.2" Model: NAU-013; Color : Dark Gray, Black;Net Weight : 258g; Creates bubbles in fish tank while attached to an air pump(air pump is not included). Please soak the air stone in water for at least 15 minutes before use.