Crafted from high-purity virgin USP Class VI Medical grade polypropylene (PP) in strict accordance with US FDA 21 CFR standards, Abdos Centrifuge tubes ensure purity by being free from natural rubber and heavy metals. The skirted bottom design enhances ease of use without requiring a rack, while the inclusion of a large white frosted section facilitates effortless writing for clear labeling. Furthermore, the tubes feature silk-screen graduations, providing a straightforward method for easy and precise identification during laboratory procedures.