These sterile disposable PYREX® serological pipets, calibrated "to deliver" (TD) with blow-out, offer long, slender, tapered tips to make pipetting go faster and easier. Fire-polished tips for burr-free, even flow rates. Easy-open Steri-View™ wrappers (one side paper, one side plastic) have color-coded sizes printed directly on the paper for easy identification by size. Colors conform to I.S.O. standards. Reference: ASTM E-714.