All pen knives have in common two blades on opposing ends Varying in length from 258 in to 338 in closed, you can pick the one that best suits you The clip blade which sits on the pocket end while the pen blade sits on the cap end The clip blade is commonly used as a multipurpose blade and preferred for detail work The pen blade is great for small detailed uses, especially for everyday use such as opening envelops and boxes This knife is constructed with CASE TruSharp stainless steel which is a special highcarbon steel that helps the blades hold an edge longer than conventional steel It also offers extraordinary blade strength and corrosion resistance