Opinel is going high-tech with space age materials. This heavy duty survival knife features a 2.5 mm thick 12C27 sandvik blade, a thick serrated area that can cut natural and synthetic ropes, an integrated 4 seasons 110 db survival whistle and a shackle key for 4 to 10 mm shackles.. The water-resistant handle features a non-slip area (red area) and can resist extreme temperatures (-40c to + 80c). - Stainless Steel 1/2 Serrated Blade - Limited Lifetime Warranty - Pea-less safety whistle - Shackle Key - Lanyard - Made in France