Micronova Cleanroom Retractable Pens feature low sodium, indelible ink and a unique low particulate barrel to limit particle generation. • Indelible, low sodium ink pens • White, high-density polypropylene barrel • Holds up to IPA, bleach, and phenol wipe downs • Available gamma irradiated for aseptic environments Designed for documentation and labeling in cleanrooms and aseptic environments. Gamma irradiated pens are suitable for Aseptic ISO 5 and other clean production areas.