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The ION TWIN is a completely different concept in Twin fin designs. It has a slightly wider than normal nose and a shortboard rocker. The feeling is super fast with tons of drive and very responsive. The higher rocker allows you to do turns where standard Twin fin boards don't fit in the wave. This model works well in beach break waves as well as barreling reef break waves. The ION TWIN is always based off the magic prototype which is 5'6 x 18 3/4 to ensure the rocker and outline are working perfectly in sync. Taking a simple approach, there is very minimal concave on this model.