Clamshell is a triangular, single-use, clamshell food container that holds one 9" pizza slice. The improved side lock design keeps the clamshell securely closed, to help prevent spills. To create the lock, fold the lock tab on the perforated lines, then close the lid so that the folded tab clicks into the slot. Made from premium SBS paperboard. Food Container Type: Box; Material(s): Cardboard; Food Container Material Type: Paper; Color(s): White.