Primo 4'0 Wake Skimboard. The Primo features a wider tail for sharper, more pivotal turns and the crisper channels offer better hold throughout your surf. A single center fin for the classic Skim feel or Twin fin for the hybrid surf feel, It's up to you which wave to take. Still constructed in our bombproof Durashell construction, the 2021 Primo gives you multiple options to find your ride. Single Concave with Quad Channels.