The S Surf series stabilizer has a lower stall-speed. Surf-inspired, these Stabs are designed to operate at low speeds, love to carve and turn. Pair with the SF and P Series. Sonar S215: The S215 Surf stabilizer has a lower stall to complement the SF Front Wings. Its moderate span creates an aspect ratio high enough for efficient pumping, while remaining compact for responsiveness in turns. low-speed performance Tips curve upwards to provide directional stability, inspiring confidence during takeoffs and grip in turns Sonar S185: designed to pair with the smaller SF Series Surf Front Wings Its moderate span creates an aspect ratio high enough for efficient pumping, while remaining compact for responsiveness in turns low-speed performance Tips curve upwards to provide directional stability, inspiring confidence during takeoffs and grip in turns Sonar S145v2: The S145v2 is designed to provide the fastest, loosest surfing feel Its anhedral rondure loosens up the front wing in the roll axis, while the foil sections ensure predictability and a broad speed range. Its moderate span creates an aspect ratio high enough for efficient pumping while remaining compact, with increased roll-ability for tighter and snappier turns. Recommended for use prone or tow surfing with smaller Front Wings, by intermediate to advanced riders seeking increased maneuverability and speed. Item includes: Stabilizer Cover Screw Pack C (M8x16) Check the Size Chart for some more information.