The Kershaw Ken Onion whirlwind knife blade is made from 440A stainless steel and has a polyamide handle. This beauty has a 3.25" blade and the 1560ST model blade is partially serrated. Closed this knife is 4.5" long and weighs in at 3.5oz. Kershaw 1560 Whirlwind Folder 440A Stainless Drop Point Blade Polyimide