uxcell 10 Pcs 4mm Connector Blue Fish Tank Aquarium Bubble Airstone 25mm x 12mm Package Content: 10 Pcs x Aquarium Air Stone; Total Size: 13 x 9 x 2 Color: Blue; Material: Mineral, Plastic Product Name: Aquarium Air Stone; Net Weight: 47g Stone Size: 15 x 25mm/ 0.6" x 0.9"(D*H) Connector Size: 4 x 3mm/ 0.15" x 0.13"(Outer Dia*Inner Dia)