Deflow KEEL QUAD finsKEEL QUAD These fins are going to completely change your surfboard performance. Many surfers find difficulties to turn on quad surfboards. The problem is not the concept but the wrong choice of ends. This fins will give you easier turns while holding you on long and powerful turns. Keel Quad fins have a great area which provides a lot of drive. But the rear fins have a really upright template for performing tight radius turns. So they have a balance