Slide-Fix Slide Jars are used in a variety of applications including preservation and transport of Pap smear slides, post-surgical tissues and fine needle aspiration (FNA) biopsies. Slide jars have a volume of 30 mL and accommodate and protect up top 4 slides. Slide jars are made of a Polypropylene Co-Polymer that is nearly transparent with the strength of Polypropylene. Bulk packed.