The ISS stringer adjusts the flex of your board.
Available in 3 flex levels:
– Soft Flex: for cold waters and for riders who are looking for flex. 20% bidirectional fiberglass, 80% unidirectional fiberglass.
– Mid Flex: for cool waters. 20% carbon fibre, 80% bidirectional fiberglass.
– Stiff Flex: the most rigid one. For warm waters and riders who are looking for rigidity. 60% carbon fibre, 40% bidirectional fiberglass.
Available in Medium size for 39,5″ to 41″ boards and in Large size for 41,5″ to 43″ boards.