Features: Non-Conductive Tape Designed For Use Around Live Circuits; Strong S-Class Core For Longer Life And Greater Pushing Power; Smooth Nylon Jacket Provides Great Handling Around Bends; Omni-Directional Pushing; Structural Glass Core Gives You A More Durable Fiberglass Tape; Case Diameter: 16 IN; Replacement Tape: 31-165; Diameter: 3/16 IN