The FK647 fuselage is designed to minimize hydraulic structure resistance and increase performance for kitesurfing.It is CNC shaped to have the smoothest surface possible and then subjected to a 50 microns hard elox surface treatment to improve corrosion resistance. Always 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