The 600ul well plates are for smaller volume applications and are DMSO resistant. The 1.2ml well plates are easy to empty completely and ideal for culturing bacterial cells. Can withstand centrifugation up to 6000g by using microtiter plate rotors. Not DMSO resistant. The 2.1ml well plates are used mainly for compound storage and enzyme assays. DMSO resistant.- Deep Square Well Plate, Round Bottom, 2.2mL, Yellow, Polypropylene, 4/pk, 6 pk/cs 14-21 Days