The Cold Steel Knife Koga SD1 91K is made up of unbreakable plastic and has an SD, produced by the company Cold Steel. A person who knows how to use this knifewith perfection can defend himself at all times. The blades of the knife are fixed and it weighs 4.1 ounces. The thickness of the knife is 11/5” and is overall of 71/2”. It has a very stylish body, which ensures that the grip on the knife is also firm and the user does not have any problem when it is time todefend himself.