The Sulphur City Steam Rollers' annual sell-out event is returning to the city for its third year.
Slam Rock sees the Steam Rollers' A-team Motley Crew take on the Taranaki Roller Corps on July 16 in an on-skate battle not for the faint hearted.
In roller derby, which is full contact and has been likened to 'rugby on skates', players skate around an oval track in a pack made up of eight skaters, four from each team who hold the position of blockers.
Blockers must remain within a certain distance from each other at all times. Also on the track are jammers, one from each team who are the point scorers. It is the jammers' role to attempt to 'break' through the pack and score points for each opposition player they pass.
With a mix of Slam Rock veterans, along with some of the league's newer players, this year's Motley Crew are sure to have a large group of supporters in the crowd and it is anticipated tickets will sell quickly.