Round well styles feature vented lids for gas exchange and recessed areas around wells that act as a water reservoir to reduce evaporation from wells. Dishes with 6, 12, 24, and 48-well formats include lids with condensation rings to minimize evaporation. The 12 and 48-well dishes have a standard 96-well footprint. Rectangular well styles offer a larger culture area. They also accept standard glass cover slips: 24 x 60mm for 4-well plate; and 22 x 22mm for 8 well plate. Radiation sterilized.