Cleaning out upholstery workshop.  Going out of business.  These are straight edged 30" metal tack strips and plastic covers, 12 each.  Made in USA by Massasoit/Tackband, Inc. called Tacktite.  Approximately 1/2" wide with spikes 5/8".  Can be cut to length with tin snips if needed.  Used in upholstery and re-upholstery projects to secure fabric and make a clean, staight edge.  They create a professional look.  No stapling required.