Roller derby is a competitive, full-contact sport with no choreographing. Most leagues play on flat tracks because they are more prevalent than banked tracks. Skaters wear old-school quad skates.
Jammers wear the star on their helmets and use speed and agility to score as many points as possible during each jam. A jammer must cut through the pack, passing all her opponents. If the opposing team is able to hold back the jammer, no points are scored by her team. The jammer who legally cuts through the pack first is the lead jammer. Only the lead jammer can call off the jam before the clocks ends. The advantage to being the lead jammer is that she can call off play before the other team scores more points or if she is having trouble getting through the pack.
PACK:Three blockers and one pivot from each team compose the pack and attempt to stop the opposing jammer from scoring points. These versatile skaters simultaneously play offense and defense as they skate around the track.
PIVOT:The players with the stripe on their helmets set the pace for their blockers. The pivot is often the last person the jammer must pass, making her the last line of defense for her team.
BLOCKERS:These skaters follow the pivot to clear a path for their jammer and destroy the opposing jammer. Playing defense, they block the opposing jammer, preventing her from passing them and scoring. Offensively, the blockers assist their jammer through the pack.