Romex SIMpull cable is the culmination of extensive lab testing and field research conducted through Southwire's D.B. Cofer Technology Center, one of the world's leading centers for wire and cable technology. In the beginning, our goal was to simply improve NM usage by making it easier to pull without raising distribution costs. Where we ended is a revolutionary new grade of NM.  It pulls 50% easier, is tear resistant, reduces burn-thru and strips easier.