Davis Instruments Whale Tail XL Alumnm Stabilizer Fin. The fin's unique hydrodynamic design extendsbehind the prop to utilize prop wash energy which is normally lost. Whale Tail transforms this energy into lift for immediate response when the throttle is applied. Use the Whale Tail XL in freshwater or salt-water to improve performance of any boat. Other benefits include fuel savings and increased top end speed. The 15-minute installation is simple and straight forward. Made of sturdy marine-grade clear anodized aluminum plate. Stainless steel mounting hardware is included. Specifications for Davis Instruments Whale Tail XL Aluminum Stabilizer Fin: Manufacturer: Davis Instruments Color: Black Features of Davis Instruments Whale Tail XL Aluminum Stabilizer Fin: Stabilizes bow-light boats Pops skiers up in less time Flattens wake for water skiing Smooths out ride in rough water Reduces porpoising and cavitating Increases top speed and fuel efficiency Installs in 15 minutes with stainless hardware included Package Contents: Davis Instruments Whale Tail XL Aluminum Stabilizer Fin Davis Instruments 448: Whale Tail XL Alumnm Stabilizer Fin