This North Sails EPX.Base + Tendon windsurfing mast base is extremely cost effective and durable! The single screw and twisting base make adjustments a breeze and minimizes setup time. This is a euro pin style base that will work with euro pin extensions. The tendon middle makes your windsurfing rig feel more fluid during sail maneuvers compared to u-joint or mechanical bases. We highly recommend this style base because of its durability, low cost, and solid feel while windsurfing!