Pack of 5x 5-micron Sting Wound Filters String wound cartridges offer true depth filtration with high dirt holding capacity and extremely low media migration. It is manufactured using a high speed, continuous wind process which creates a superior one-piece filter with hundreds of diamond shaped tunnels that get progressively smaller from the outer diameter to the core. Finer particles are progressively trapped as fluids travels to the center of the filter allowing for much greater retention capacity than that which is associated with straight surface filter media of the same dimensions and porosity. What's in the box 5x 20 inch slimline (20x2.5" size) 5-micron String Wound Sediment Filters