SYSTEM RACK(PP), Low cost and high chemical resistant: The body and lid, made of Polypropylene(PP) is lightweight, durable, and highly resistant to chemicals and heat. Because of its inexpensive cost compared with System Rack (PC), this System Rack(PP) can be disposed as one time use if used with non-sterilized long tip, or can be reused even after autoclaving if tips are manually refilled. Note: The rack made of PP shrinks slightly after autoclaving, consequently refill plate cannot be used. RNase/DNase/Human-DNA free certified. --Pipette tip compatibility--- Watson NEXTY : 100-1000ul/1000ul(F), Eppendorf Reference/Research V : 100-1000ul, Gilson Pipetman : P-1000, Finn pipette Digital : 100-1000ul, Biohit Proline : 100-1000ul, Nichiryo Nichipet : 100-1000ul.