The Surf and Rail Adapters fit and mount to any skateboard - Designed and Assembled.Experience 3x tighter turns, smooth high speed pumping, improved flow, maximum deck articulation across front and rear, and increased grip around curves for all 4 wheels.Enhances truck performance for a skateboard, longboard, or drop-through board.Transforms a regular or reverse kingpin truck into a surfskate truck - great surf trainer How does this system compare to for Carver c7 and the swelltech surf skate? the jamie o'brien pro model in particular.Answer:The Surf Adapter lets you turn much deeper that a for Carver C7 and perform surf manuvers that are much more true to surfing that a Carver CX truck. surf skate with its for Jamie O'Brien pro model boasts the V-truck which can spin 360 degrees, but this makes them extremely unstable at medium or high speed and nearly impossible to use as a practical mode of transportation. The Surf Adapter has a unique geometry that allows you to hill bomb with confidence and stability. Most importantly, the reason why the Surf Adapter is so special is because it enhances everything that made you love your skateboard in the first place. The skateboard deck, trucks and wheels that you picked out will still feel familiar with the Surf Adapter, and you will still recognize the characteristics that make your skateboard unique.Material:Aluminum alloycolour:SilverPackage Contents:1 * Front Truck-Surf Adapter1 * Rear Truck-Rail Adapter4 groups * 23mm screw+ nut12 groups * 25mm screw+ nutOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.