Bellco manufactures all precision pipettes from type 1 class a Borosilicate glass. All bellco pipettes feature tempered tips and permanent silk screened graduations to withstand repeated usage and alkali washings. Shorter length facilitates use under biological hoods Plain top promotes rapid, even flow (use rubber bulb to fill) Calibrated to tip Tempered tip; to deliver; blow out Tolerance +-(ml):0.08 Oal (mm):160 Color code:blue