specification1k,3k,6k,12k,24k, 36k, 48k Impedance range:385, 307,133, 66, 33, ... :300-600V, Outer diameter:2.0-5.5mm Heating conductor:Carbon Fiber, Product life:>3000 hours Bending test passed:5000times bending test ... use, churches, classrooms, swimming pools, stadiums and amusement parks for kids, also for greenhouses and artificial incubation rooms. Outdoor application: snow-melting ...