RaceFace Turbine Pedals - Platform, Aluminum, 9/16", PurpleTurbine is the most concave flat pedal designed for climbing, mobbing descents and tackling the most demanding terrain where riders are all in on grip. Covered by a Lifetime Warranty inclusive of crashes and available in seven colors. The most locked in feel you can get on traditional flat pedals, for when good grip just isn't good enough. A concave pedal gives riders a locked in feel by cradling your foot in a "pocket" created by the platform.