The 528 Customs Monster V3 is a beast of a tank and perfect for anyone looking for lots of juice and a great sub-ohm experience. The 510 pin is made out of copper and allows for any hybrid connection to work. The massive air holes in the base act as cooling around the center pin and main block. Allows for sub ohm chain vaping without melting down the insulators. The center pin and block are one piece that is gold plated allowing less voltage drop and much more airflow due to the air hole size.