He used to be the hardest puncher p4p, but at 130 and 135 its more his speed along with his power in a RJJ sense that makes him a KO artist. He doesn't hit IMO p4p as hard as Cintron or Wladimir(who I think hits harder than Peter) or Valero, but he hits oponents with punches they don't see and at a high frequency, but at 122ish weight he hit bloody hard.