Windsurfing mast program is based around three performance levels: FLX100, FLX70 and FLX40. All masts ensures optimum control of fiber preload and resin distribution throughout the laminate (avoiding risk of air bubbles that could cause local weakness). All masts are featuring the unique progressive flex and bend curve, compatible with all sail models on the market. Higher performance level masts will have higher carbon content reducing the weight of the mast as well as significantly increasing reflex and overall performance. Visit here:- www.bestwillcomposite.com/product/list-en-133.html