Brand new from Chinook, the 1-Bolt Pro Flex Mast Base features all of the advantages of a tendon base with the added features of a mechanical base. The tendon gives you shock absorption for less stress on you and your board. The mechanical hinge at the top allows you to easily attach your rig to a wide windsurfing board (like a foil board). Uses a standard Chinook Tendon for easy replacment. Made in cast 316 Stainless steel like our other Europin bases so it will be extremely durable & have the distinctive look of polished steel. Available in 2 Bolt and US Base Cup versions!