SYSTEM RACK (PC): Tough & extremely durable The body and lid are made of polycarbonate(PC), which does not lose its shape over time. It can also be autoclaved repeatedly. Long Size: Convenient when using 5ml test tube of length 75mm. RNase/DNase/Human-DNA free certified. --Pipette tip compatibility--- Watson NEXTY : 2-20ul/10-100ul/20-200ul(M)/20ul・100ul・200ul(F), Eppendorf Reference/Research V : 2-20ul/10-100ul/50(20)-200ul, Gilson Pipe man : P-100/P-200, Finn pipette Digital : 2-20ul/5-50ul/10-100ul/20-200ul, Bio hit Proline : 2-20ul/5-50ul/10-100ul/20-200ul, Nichiryo Nichipet EX : 2-20ul/10-100ul/20-200ul.