Aquaneat 40PCS Aquarium 4"x2" Cylinder Air Stone Fish Tank Aerator Diffuser Hydroponics

Dimension: 2 "D x 4" H, fit for 3/16" standard airline tubing Made of safe, washable and non-toxic material Accelerate oxygen replenishment Increase water circulation when used with a high-output air pump Include: 40pcs of air stones. Great for freshwater, saltwater/reef aquariums and hydroponic use