Roller Derby Pro Octane Magnesium plate The Octane Magnesium Chassis is our Flagship plate made for Every Type of Skating. Made from High Grade Magnesium with Ten Degree Aluminum Trucks giving the user superb controland high energy return. The Octane is featuring micro adjustable trucks for precise tuning and interchangeable cushions for varying degrees of hardness and rebound.The Octane Chassis is Made for Skaters looking for a light weight, firm,performance and competition skate for Speed, Derby, Hockey or Rhythm. The Octane is strong and ready to take on nearly every skating adventure. The Octane Chassis is available in sizes 525 - 800 (in millimeters) which is equal to sizes 3.5-14 US