Expert of Japan Aisen SP (Super) Little Bear Set ST31 6-Claw Little Bear. Features 6-Claw Light Aisen that was first researched in the world. Perfect fit for any shoes, including trekking shoes. Patent for Inventing Crisp Claws Angle. Made of the finest chromoly steel. This product boasts hardened and painted by the most advanced Japanese technology. Worlds Lightest Compact size The time to put on and take off is not as good as a one-touch crampon. This is an excellent product that will outperform your wearing experience. Expert of Japan Aisen SP (Super) Little Bear Set ST31 6 Claw Specifications Fine Adjustment One Size Fits Most Material: Chromoly Steel Color: Black Electrodeposition Size: 6.6 x 4.3 inches (168 x 110 mm); Weight: 1.8 oz (505 g); Claw Height: 1.2 inches (31 mm); Expert of Japan Eisen SP (Super); Little Bear Set ST31; 6-prong Material: Chrome Molybdenum Steel is used by Expert of Japan (EXPERT OF JAPAN). SCM435M is a burlite steel with an added 0.15-0.3% molybdenum to chromoly steel. Increased tempering properties and will not cause tempering or brittle