Made of 12 ga carbon steel, insulated with high-impact, hot-melt PVC bonded to the top of the staple, tumble deburred and with rust inhibitor applied. Reduces risk of electrical fire and prevents a short circuit if the insulation is cut. Color coded for size and application and highly visible. Used with BX or Romex 3 conductor, #14, #12 and #10 WG or 2 stacked oval Romex #14 and #12 WG. Rated for up to 2500 V. Dielectric rating per ETL Test 525777.