Available in 33 mm and 45 mm neck sizes. The 500 ml filter is available in CA, CN and NY in both 0.2 µm and .45 µm pore sizes. The PES is available in only 0.22 µm pore size. Filters are colour-coded by membrane type. Individually packaged, sterile and certified non-pyrogenic. Prefilters included. Packaging: 1/pk 12/cs