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Tri-fin / thruster configuration
the Radius Prime delivers even more precision
it works on just about anything
Relaxed fit for easy everyday wear
True Ames Side Bite 4.0 - FCS Compatible (Hexcore) Size:4.0" Tri-fin / thruster configuration( 2 Fin Set ) FCS Compatible: These side bite fins are designed to provide the maximum amount of performance when added to a single fin on 2+1 surfboards. A great all around template, these fins will provide that extra level of stability, projection, and hold you are looking for out of your setup. Our side bites are offered in six different sizes, so you can find a set to meet any style of board or any sort of need! HEIGHT: 4. 0 102 mm BASE: 3. 9 99