The main important component of any Earthing or Lightning Protection System is the actual Conductor. SPEEDWELL's Bare Copper Tape is manufactured from finest quality Cathodes of purity 99.99%. These Tapes is Annealed for ease of use with radiused edges and are Oxygen free (Oxygen 5ppm). Each meter of the coil is Stamped with - spEEdweLL - BS EN 13601 - The KA Rating is based on the recommendations of BS:7430 with an initial temp. of 30 Deg. And a Maximum of 250 Deg. C. Materials: Oxygen Free Copper BS EN: 13601 (Before BS: 1432 C101 / C103)