This Cut Pro® sleeve with Hero™ Technology is made of a high performance, cut resistant material that achieves exceptional cut resistance and comfort levels. The proprietary blend of ARX® aramid, stainless steel, and other fibers are used for general purpose work applications to provide cut and abrasion resistance when working with sharp objects. The 9318K13T is an 18 inch sleeve with a thumb slot and will help protect your arms in rugged environments.