The sheath aka saya covers your knife and helps protect from damage during transport or when kept in a draw. We strongly recommend using sheaths/sayas to all our customers as they are a snug fits and will prevent scratches and bending. The sheaths do not contain any strong resigns and are moisture resistant and are made with Magnolia wood. Please be sure to clean and dry your knife well before placing into the knife cover, each knife cover is different when it comes to brands so please make sure you select the matching sheath to its blacksmith.