Shun VG0016 Petty Knife, 5.5", Silver The Shun Blue 5.5-Inch Petty Knife is an all-purpose, utility knife; great for sectioning citrus, or peeling and slicing vegetables Featuring Japanese san mai (meaning, "3-layers") construction; carbon steel sandwiched between two layers of stainless steel Blue Steel cutting core of fine-grained "blue" carbon steel hardened to 61 Rockwell Knife blades feature a mirror-polish that enhances stain resistance; Light bead-blasting along the edge shows off the san mai construction Made with traditional Japanese knife handles; each knife comes with a Japanese-style saya, or sheath