In- Features: Can filter out large particles,effectively protect the water purifier Extend the filter life,quick and easy installation Material:PP+ Stainless steel Package include: 4 Pcs FilterSend according to the size you choose working principle: Under the influence of pressure, water flow from high pressure to low pressure. When water flow through the net core, impurities which are bigger than the gridding size will be filtered. Thus achieve to separate water and impurities. Product Features: 1.Filter all impurities which are bigger than gridding size. 2.Not recommend for use in water which contain rich algae and organics, because it will be not convenient to clear net. 3.More suitable for use in low pressure system. Notice: The size is measured by hands, please allow minor error of measurement. Photo color might be a little different from the actual product due to color display of different monitors.