Combat Zone Wrestling (CZW) is an independent professional wrestling company founded in 1999 by John Zandig. The company is headquartered in Philadelphia, Pennsylvania. They are known for their hardcore wrestling style which is dubbed as "ultraviolence". The company holds an annual Tournament of Death show that highlights the ultraviolent style of CZW and their annual Best of the Best highlights the technical and aerial style of professional wrestling. They hold annual shows at the Asylum Arena which was the former home to Extreme Championship Wrestling.