supplied with single vial compressor, PTFE membrane, pore size 0.2 μm, clear vial color, pack of 100. supplied with single vial compressor, polypropylene membrane, pore size 0.2 μm, clear vial color, pack of 100. WHAGN203NPENYLSP. supplied with single vial compressor, Nylon membrane, pore size 0.2 μm, clear vial color, pack of 100.