Strike Thruster Fin SetThe Strike thruster fins were designed to deliver fast, tight turns in steep, critical sections. Ideal for advanced and professional SUP surfers, the upright nature of these fins with 32. 5 of rake (sweep) increases pivot for fast and snappy turns, especially when navigating hollow waves and beach breaks. For surfers looking to perform aggressive turns and maneuvers, these fins will help increase your speed and dare you to smack the lip.