100/Flat, blue non-gyn filters, 5.5μm, compatible with standard LBC processors. StatPrep™ ultra-thin, micro-porous polycarbonate membrane films are manufactured in a clean room environment. A multi-step process starts with blasting membranes with accelerated heavy ions creating a highly consistent, specific pore size. Further processing ensures an ultra-thin surface that is chemically etched to assure consistent cellular results.