UTUO High Temp. Separated Red & Black Silicone Wire is made of premium copper with tinned tech as conductor and soft temper silicone as insulator. 0.08 mm diameter per strand which is extremely thin for a high conductive capability. Tinned layer ensures anti-oxidation for durable usage. Insulator adopted silicone rubber brings the great features of high temperature resistance up to 200 ℃ which is not easy to burn while soldering and other extreme environment. What's more, comparing PVC wire, it's more soft and flexible. UTUO silicone wire covers the models from 8 gauge to 30 gauge for your choices.