The FKR604 is designed to maximize performance during kitesurf racing.It is CNC shaped to obtain the smoothest surface possible and then subjected to hard elox 50 micron surface treatment to increase corrosion resistance.IKA registered 2020/2024FITS ONLY WITH FRONT WING W670Always keep the threaded holes clean and lubricate them often using lithium grease (code MHW033) to avoid and prevent oxidation and corrosion due to seawater. Always clean your fuselage with fresh water after use