uxcell 4 Pcs Striped Colored Plastic Air Bubble Stone for Fish Tank Aquarium Add Oxygen to keep water roots healthy, put fishes live at ease. Suitable for fish tanks, ponds, aquarium and hydroponic use. Net Weight: 52g;Total Size: 4.5x1.5x1.5cm; Material: Mineral, Plastic Product Name: Aquarium Plastic Air Stone ;Color: Multi Color Variation Theme: Pattern; Package Content: 4 x Aquarium Plastic Air Stone