Universal cup for push pin system Also called Cup system or US base, the Push Pin system is used in the US. It is a very secured product due to the best force repartition between the cup and the joint. Produced in high quality materials and adjusted precisely, Nautix mast base are the windsurfing reference. Each Nautix mast base is equiped with a "Shock Absorber" plate to limit vitration and point load without non skid paint deterioration. Nautix has developed 3 diferent types of mast base for a better adaptation to your navigation style. Make your choice! - TENDON JOINT: Both stiff and solid, the TENDON is perfect for freeride and slalom. Note that any tendon can be dammaged if it is left bent at 90° during prolonged time. It is not recommended for beginner. Mast base are very important element for your security. Tendon joint, Mecanical joint or Diabolo are wearing pieces that must be checked before each session and changed regularly in case of doubt on the system.