There are various styles of trays, from the simple double endwall self-locking (tuck-in) to the self-locking tray with cover.Trays normally made up of B flutes for easy folding. Perforation line along the folding edges may help in its folding during the feeding process on auto-packing line. Trays generally apply to those products which require self-support and in rigid form container. After shrink wrapping with thin layer film that tightens the products in position, tray will act as a support. Trays are not shipping containers, but they are frequently used as inner container for parts, delicate products, letter, mail and so on, or as an element of the display stands.