Mountain Tree Filter Brushes are made of new plastic material with good shape and not easy to deform can be used for more than 5 years, which is 5 times than conventional brush. Mountain Tree Filter Brushes are used for mechanical filtration in the first filter chamber where the coarse dirt particles, such as remove fish waste or dead plants and algae. Also they are very good settlement area for beneficial microorganisms. Mountain Tree Filter Brush is the optimal choice for canister filter, trickle filters, baffle filters and internal filters and so on. Special Cross Shape Filament is special design patented by our own, which is 4 times specific surface area than other brushes. It will generally enhance the mechanical filtration. Obviously strengthen the ability of adsorption and provide a massive surface area for biological colonization Eco-friendly new material and 304/316 stainless steel: The fine polypropylene fibers are closely incorporated cylindrically in two stainless steel wire Size : Dia7.5 cm or 12 cm, length 16cm Material : Virgin PP material, 304/316 stainless steel Function : Mechanical filtration and biological filtration BOX OFFER : RM5.50 each for 10 !