This Corning low evaporation lid for 96-well micro plates comes with a corner notch. It is made of rigid polystyrene. The corner notch on the A1 corner corresponds to the corner notch found on all Corning micro plates. Lid does not fit Corning 2µL 1536-well micro plates or 2mL 96-well storage blocks. Sterilized by gamma radiation. Bulk packed 25 per bag with 50 per case. Sterile. Includes Condensation Ring. Material: Polystyrene. Plate Format: Lid. Surface Treatment: Not Treated. Corning #: 3931.