TPX100 SDM / RDM Masts 100% carbon prepreg construction using special Torq-Preg construction in the base of the mast. This unique prepreg material features +/- 45 degree fiber orientation. This helps to control torsion, particularly in the boom area. This construction results in extremely light weight mast with very fast response time! MASTS Mast program is based around three performance levels: TPX100, SPX90-95 and SPX65. All masts are made using pre-preg technology that ensures optimum control of resin content and resin distribution throughout the laminate (avoiding risk of dry spots that could cause local weakness). All masts are featuring our unique Progressive Flex & Bend Curve, compatible with previous sail models. Higher performance level masts will have higher carbon content reducing the weight of the mast as well as significantly increasing reflex and overall performance. Every NeilPryde sail will perform to its highest potential when used with the specified NeilPryde mast because our sails are designed around our mast curves. The NeilPryde RDM masts are compatible in curve with NeilPryde SDM Masts. Choose a RDM mast for a softer, more forgiving feel and durability and a SDM mast for faster response, stability and more direct feel. We recommend the use of SDM Masts on cambered sails.