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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, though it is most popular in the United States.
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Roller derby | Clubs | 5,000+ | 1.00 | infobox |
| Roller derby | Contact | Full | 1.00 | infobox |
| Roller derby | Equipment | Roller skates, helmet, knee pads, elbow pads, wrist guards, mouthguard | 1.00 | infobox |
| Roller derby | First played | 1935, Chicago, Illinois | 1.00 | infobox |
| Roller derby | Highest governing body | WFTDA, MRDA, JRDA, World Skate | 1.00 | infobox |
| Roller derby | Nicknames | Derby | 1.00 | infobox |
| Roller derby | Olympic | No | 1.00 | infobox |
| Roller derby | Team members | 15 on roster, up to 5 on track during each jam. | 1.00 | infobox |
| Roller derby | Type | Indoor, roller sport | 1.00 | infobox |
| Roller derby | Venue | Roller rink, pitch | 1.00 | infobox |
| Roller derby | is a | roller skating contact sport played on an oval track by two teams of five skaters | 0.90 | text |
| Roller derby | is a | international sport | 0.90 | text |
| Roller derby | is a | Men's Roller Derby Association | 0.90 | text |
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