Wire Strap 321301ST Floor Heat Cable Strapping. Each roll has 25 ft of strapping good for approx. 40 - 50 sq ft. of floor heat area. I have 2 rolls for sale, 1 in the original box and 1 without a box. 

Note this sale is for one roll only. The second picture is showing both rolls but each sale is only for one.

If you would like both rolls I can combine shipping.