Hard plastic shell and with auto high-carbon steel blade retract. So Handy for so many things. Easily Slices through cardboard, plastic packaging, sealing tape even strapping tape used on boxes, stubborn packaging. It’s a great tool. Great little cutter. Light weight and easy to carry. Letter opener, even heavy padded envelope. Boxes cutters in handy and easy to use. Small, safe, reliable and makes a great gift to your friends, co-workers.