Use this polyguards polypropylene and metal sharp edge kitchen knife. Made out of a special heated metal, specially treated to retain their sharpness giving the user a pleasant and easy cutting experience. They are also famous as the kerala naadan katthi. Edge technology creates a blade that is sharper out of the box, holds its edge longer and is easier to resharpen. For getting optimum performance and long durability, we use proprietary process to heat-treat our blades. We assure once you started using this knife you forget all other knives.