The PLKB G10 Kiteboarding Fins 50mm (set of 4) are made from super strong G10 material for durable quality. The Fins are asymmetrical shaped to create more upwind performance and grip due to the wing shaped profile. 50mm is perfect for the PLKB Patrol board or to have more grip with the Shepherd or Capital board. 50mm fins give more grip for upwind riding and grip for high jumps. They come complete with 8 screws.