This is a high quality clone by KSD. It has a sturdy stainless steel construction with copper contacts, there is no doubt this one is a hard-hitter. The positive battery pin is adjustable so you can fit your 26650 battery with no rattle. Deep cut air channels in the top cap ensure that you get adequate airflow even on flash mounted tanks. The 26650 offers longer battery life.All in all, this is a tough looking mod that makes a statement.