Set of 2 LBX4 fins for use in the Lokbox fin system. 50% glass-filled nylon molded composite fins that are very full foiled from base to tip. The result is a much stiffer, snappier feel over traditional composite fins. Base: 4 1/2" or 114 mm. Height: 4 5/8" or 117 mm. Ideal Weight: 140+ lbs or 63+ kgs. Timmy Patterson template. Performance fin with power and drive for the medium size surfer. Larger base and fuller tip. A popular front set for quads when paired with the LBXM 3.8.