Jardin Round Bubbles Plastic Air Stone for Aquarium, 4.5mm Diameter, Green Product Name : Aquarium Bubbles Air Stone; Suitable for : Fish Tank, Aquarium Total Size : 7.4 x 4.8 x 1.2cm/2.9" x 1.9" x 0.49"(External Diameter x Inner Diameter x H); Import Diameter : 4.5mm/0.18" Air Inlet Stick Size : 1.6 x 0.49cm/0.62" x 0.19"(L x D); Color : Green, Blue Net Weight : 28g; Package : 1 x Aquarium Bubbles Air Stone