FCS II CHRISTENSON TWIN - BLOOD REDFCS II CHRISTENSON TWIN BLOOD RED 23 24 $184. 95 The Christenson Twin Fin set provides smooth and fast down the line speed. Overview From high performance twins to more traditional shapes, this is a perfect compliment to your twin fin. This set provides smooth and fast down the line speed. Board Types Recommended for all board types including fish, funboard and twin fin boards. Designed to fit the FCS II Fin System. Performance Glass (PG) fins are