Details from DB:
The Standard Proto is one of the most popular boards in flatland skimboarding. This board excels in almost any conditions. The Protos bi-directional shape reduces swing weight at the tip and tail of your board making it easier to pop. Its sidecuts keep the board tracking straight in the water and its wide waist creates an extremely stable ride. This board can do everything from the most technical flatland tricks to the gnarliest PVC rails and boxes.
The Standard Proto comes in two sizes, Medium (41.4"x19.63") and Large (43.4"x20.5"). The medium size is a better board for technical maneuvers while the large is better for bigger riders and deeper conditions.