uxcell 2 Piece Plastic Aquarium Tank 3 Layers 1 Under Gravel Filter Board, Black Color: Black; Package Content: 1 x 12P Under gravel Filter,1 x Air Line Hose Total Size: 28 x 14 x 4cm/11" x 5.5" x 1.6"(L*W*T); Material: Plastic Product Name: Under gravel Filter; Net Weight: 295g Weight: 10g Hose Hole Diameter: 0.4cm/ 0.16"