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Derby skating from en.wikipedia.org
Roller derby is a roller skating contact sport played on an oval track by two teams of five skaters. It is played by approximately 1,250 amateur leagues ...

Roller derby

Sports
Roller derby is a roller skating contact sport played on an oval track by two teams of five skaters. It is played by approximately 1,250 amateur leagues worldwide, mostly in the United States. A 60-minute roller derby game, or bout, is a series of... Wikipedia
Clubs: 4,700+
Contact: Full
Equipment: Roller skates, helmet, knee pads, elbow pads, wrist guards, mouthguard
Highest governing body: WFTDA, MRDA, JRDA, FIRS
Nicknames: Derby
Team members: 15 on roster, up to 5 on track during each jam.
Venue: Roller rink, pitch

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Roller derby is a fast-paced, full-contact sport played on quad roller skates. Each game is two, 30-minute periods composed of two minute plays, or “jams.