MBP Generic MultiRack Empty Tip Racks by Molecular Biology Products are transparent, hinged polypropylene racks for refilling with MultiRack reload stacks. Choose the rack for 10 µL extended length, 200 µL, 200 µL NX and 300 µL tips, or the rack for 200, 300 and 1000 µL extended length tips. The racks are reusable and autoclavable.