Smith And Wesson SW990 Neck Knife with Zytel Handle and Whistle. Black ABS Plastic Handle-Silver finish Blade Neck Knife Neck Chain and Whistle. Made From stainless steel bade with zytel overlay handle. 7.0 in. overall, includes sheath with wistle and breakaway neck chain.The black plastic handles are textured for a better grip, and the exposed tang has indexing notches for precision knife handling. The black Zytel sheath uses cutouts that match the handle to form a secure lock with the blade itself. The sheath also doubles as a rescue whistle, for use in the wild or to attract attention at night. Each sheath comes with a ball chain for wear around the neck, and has the Smith & Wesson logo emblazoned upon it.