Designed to be used with the Leather Cord & Needle Stitch Holder Kit, these extra cords are vegetable tanned, like our Leather Handle Kit, and we've found they don’t dry out as quickly as the original cords. They start out softer and require less conditioning so they won’t “stick” to yarn as much. For your more rustic yarns, or if you don’t mind conditioning often - the ones included in the original kit work fine, but these new extras work better for finer yarns.