uxcell Tortoise Shaped Air Stone Bubble Maker Blue for Aquarium Fish Tank Product Name : Aquarium Air Stone;Color : Blue Material : Mineral Stone;Total Size : 9 x 6 x 2.6cm/ 3.5" x 2.4" x 1"(L*W*T) Outlet Hole Size : 4.3 x 2.5mm/ 0.17" x 0.1"(OD*Inside Dia.) Weight : 78g Package Contents : 1 x Aquarium Air Stone