MBP Universal Fit Filtered Pipette Tips by Molecular Biology Products have a filter that lets air through but stops aerosols, protecting samples and pipettors from carryover. Choose 40, 100, 200, 300, 1000 or 1100 µL tips, mostly sterile and racked, with Maxymum Recovery low retention versions. Certified RNase-, DNase- and human DNA-free for PCR and RNA work.