Taken from Cocoknits website:
If you're anything like us, you have many projects going at one time. Now you can hold the live stitches of several projects at once with this extra set of leather cords.
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.
*Please note, the current Stitch Holder Kits now contain these lower maintenance cords.