Tough ABS plastic casing. Stainless steel blade with corrosion-resistant magnetic hook clip. Manual 3:1 gear ratio gives a fast and fully controlled blade retraction. Comfortable, contoured grip and clear, easy-to-read graduations. Tough ABS plastic casing. Stainless steel blade with corrosion-resistant magnetic hook clip. Manual 3:1 gear ratio gives a fast and fully controlled blade retraction. Comfortable, contoured grip and clear, easy-to-read graduations.