The Accumax A pipettes are fully autoclavable with a lightweight and ergonomic body for a hassle and pain-free pipetting experience while maintaining unmatched accuracy and precision. Fully Autoclavable, Ergonomic & Light Weight Design , Smooth Plunger Mechanism Offers Least Resistance For Ease-of-use And Long Hours Of Pipetting,High Accuracy And Precision Guaranteed, Two Step Plunger Operation Allows Forward & Reverse Pipetting Technique.