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. Universal fit on research grade pipettors Accurate, precise and reliable Exceptional clarity Certified free of rnase, dnase, Human dna and pyrogens Extended length tips enable users to reach the bottom of tubes without contaminating pipettors Graduated tips provide visible reference points Racked on 9mm centers, pipette tips provide multichannel convenience Yellow, Polypropylene Racked Tips Non-Sterile Volume Range: 1-200 ul Grad Lines: 10, 50, 100 ul Certified Human DNA Free Certified PCR Inhibitor Free Certified Pyrogen Free