Introducing the revolutionary Roller Derby Elite Octane Magnesium plates! Designed with precision and power in mind these plates feature a magnesium alloy construction for enhanced strength and weight reduction. The 10 degree aluminum trucks offer precise micro adjustments allowing for ultimate control and responsiveness. Plus with power pour-vectra urethane cushions you'll have the stability and maneuverability needed to dominate the rink. Upgrade to the Octane and take your skating to the next level! Please note: Plate size is not the same as boot/shoe size. Your boot/shoe size will tell us the plate size you need. Providing us with the length of your sole (measured to the nearest centimeter) will also help us determine the proper plate size. RD Elite Pro Octane Plates Baseplates Magnesium Kingpins 10? AngleAction Nut (18mm Wrench)Set Screw (4mm Hex)Bottom Nut (18mm Wrench) Cushions 15mm Barrel12mm Cone Trucks Aluminum8mm AxlesFixed Pivots Toe Stops Adjustable - US 5/8"Clamp (3/16" Hex) Plate Size Wheelbase (mm) 5.25 133 5.50 140 5.75 146 6.00 152 6.25 159 6.50 165 6.75 171 7.00 178 7.25 184 7.50 191 7.75 197 8.00 203 Roller Derby Elite advises ordering according to US Men's Shoe Size for a comfort fit and 1/2 size down for a performance fit. If converting from US Women's subtract one full size to find US Men's If you're interested in pairing this plate with our CR1 skate use this chart to help you select the right size for optimal performance and fit.