This Corning 96-Well egg crate style holder is made of polystyrene. Each holder will hold twelve 1 x 8 Strip well strips. The holder allows each individual well to be positioned back into the plate once broken apart. Comes with a rack. Non-Sterile. Material: Polystyrene. Plate Format: 96 Well. Surface Treatment: Not Treated. Lid: Not Included. Corning #: 2572.