TOOGOO(R) 5mm Connector Aquarium Air Stone Aerator Air Bubble Disk 4" Dia Product Name : Aquarium Air Bubble Disk;Color : Salmon Pink, Gray Blue Material : Mineral Stone, Plastic;Size : 123 x 100 x 11mm/4.8" x 4" x 0.4" (L*D*T) Connector Outside Diameter : 5mm/0.2" Net Weight : 60g Package Contents : 1 x Aquarium Air Bubble Disk