Falcon® 12-well Clear Multiwell Plate is comprised of not treated polystyrene. Flat bottom, with low-evaporation lid, individually wrapped, sterile, 50/case. Unique labyrinth lid, condensation rings, and deep-well design control contamination, reduce evaporation, and minimize edge effects. Falcon® 12-well Clear Multiwell Plate is comprised of not treated polystyrene. Flat bottom, with low-evaporation lid, individually wrapped, sterile, 50/case. Unique labyrinth lid, condensation rings, and deep-well design control contamination, reduce evaporation, and minimize edge effects.