Lee's Wooden Air Diffusers are manufactured from an all-natural wood. Each diffuser is precisely hand cut against the grain of the wood to allow the maximum output of super fine bubbles to be released from the micro pores of the wood. Increases the efficiency of air-driven protein skimmers. Replace every 3-4 weeks or when bubble size increases.
A great little product if you are looking for lots of tiny bubbles for aeration and aesthetically appealing aquarium water movement. It is very cost effective and when it wears out, I will buy it again.