AQUANEAT 210 pcs Air Bubble Stone Aquarium 2-3/8” Disc Fish Tank Stone

Widely applicable: Suitable for hydroponic systems, ponds, aquarium fish tanks, helping extend the life of your nutrient solution, keep fish/ roots healthy and promote plant growth. Air Stone Dimension: 2-3/8”D x 0.5" H Fits for 3/ 16” and 3/8” standard airline tubing. Quality and safe materials: Made of safe, washable and non-toxic material.(Soak them for at least 2 hours before use). Disk-shaped design makes it easily be hidden in your aquarium or other fish tank bubble decorations (Note: Soak them at least for an hour before use).