The Mackie Smooth Glide series is an ideal choice for surfers looking for a single fin that provides ample drive, while allowing for hard cutbacks and in pocket directional changes. Both the 8.375″ and 9.375″ fin have a wide base, with the 9.375″ transitioning quickly into a narrow tip and the 8.375″ holding more surface area through the center and tip of the fin. This fin will work well in longer mid-lengths, speed shapes, and a variety of longboards.