Bring your sailing experience to a new level - Davis Instruments introduces Blacksmith Wind Vanes, made from super lightweight 3D carbon fiber and duraluminum to withstand the rigors of hard racing.Feature precise balance - Olympic Boat Carbon Fiber Wind Vane is effective and efficient in 0.8 knot up to 40 knots wind conditions.- handmade carbon masthead wind vane for boats up to 20 ft- 9×9 in / 23×23 cm- 0.5 oz / 13.9 g- 3D carbon & duraluminum- J-base for side, top, or front mounting