Tips are manufactured from the finest raw materials using precise production techniques that provide consistent quality performance. Primary products are made from virgin polymers and contain no recycled, reprocessed, or altered plastics. Natural, Polypropylene QuickRack Non-Sterile Reload Volume Range: 50-1250ul Grad Lines: 200, 500, 1000ul Certified Human DNA Free Certified PCR Inhibitor Free Certified Pyrogen Free 768 Tips/Pack, 5 Packs/Case