Ideal for building do-it-yourself (DIY) test leads, patch cords, and test fixtures. Silicone is the best test lead jacket material, combining high flexibility, even at low temperatures, with resistance to burns and chemicals. The conductor is highly stranded soft bare copper for additional flexibility. 21 AWG (0.40 sq mm) silicone jacket, 6 A maximum current. Meets the safety requirements of IEC 61010-031 CAT III. IEC rating: 1,000 V CAT III. Conductor area: 0.40 sq mm. Stranding: #100 x 0.07mm diameter. Temperature: -60 to +180 degree C. RoHS (2002/95/EC) compliant. Blue color. Measures 2.1mm OD by 50m length.