Fits NPP-20,NPX2-20,NPLO2-20 RNase and DNase Free. Universal Fit (fits most pipettes). Ideal for molecular and microbiology applications. Prevents transferring from volatile or hazardous samples. Hydrophobic,non-gel filter prevents sample from being trapped in the tips. No sample loss with accidental over-pipetting. Endorotoxin-free Safety-barrier against accidental over-pipetting AeroGard/UniFit tips are specifically designed for use with Nichiryo pipettes and others