1. Manufactured from robust virgin-polypropylene, clarity for better visual inspection
2. Tubes provide outstanding stability, perfect sealing and protection from evaporation and accidental opening
3. Flat cap with a beveled edge comfortable for opening and closing
4. Frosted writing area on tube for labeling and writing
5. Clear molded graduations on tube
6. Flat top with a writable surface
7. Mixed color tubes have color coded insert on cap, the rest of tube is natural
8. Autoclavable
9. RNase, DNase, DNA and Pyrogen free available upon required