Specification: Condition:100% Brand New Material: Wooden Color: As Pictures Shown Type: S, L(Optional) Size: Small Length: approx.4.2cm/1.7in Large Length: approx.7.1cm/2.8in Package Included: 2 * Wooden Air Diffuser Notice: With the right choice of oxygen pump (below 5W), the wooden air bubble can produce a large number of uniform and fine foam, thus separating impurities in the sea water. (please do not use the air pump with too much air volume, which may cause the air wood to become loose, in this case, you need to roll a layer of water adhesive cloth and put it back in.)