The Bing Single-wing Quad is a modified version of the MR twin-fin of the late 1970s with a slightly flatter rocker and fuller outline. Progressing from the original twin-fin setup, Matt Calvani has added two smaller back fins to give the board more control and responsiveness. Working well in every day conditions from knee-high to double overhead waves, this board is ideal for longboarders looking to ride a smaller mid-length boards with plenty of glide. This board should be ridden 4-6 inches longer than the traditional twin-fin fish. Currently, Bing offers this model with Rainbow fins, Future fins, Canard fins, or ProBox fiberglass quad fins.