The MTC Bio C4040 40µm SureStrain Cell Strainers with (1) Reducing Adapter, Blue, Sterile, Individually Wrapped, Pack of 50, is a fast and easy-to-use solution for detaching, isolating and straining cells from clusters and tissues. A polypropylene frame supports a nylon mesh that has a 40μm porosity. The advanced frame/housing design also contributes to superior performance and reduced processing time, by eliminating the "air-lock" effect. The resulting improved aeration allows air to escape while filtrate is entering the tube, preventing messy spillovers.