Boards are produced (same as rockers) in 4 sizes: S, M, L, XXL from 18 mm melamine faced plywood.
The board on one side is smooth and functions as a slide. On the other side, it may contain climbing elements (ramp with holds) or ladder elements (ramp with bars).
The size of the board must correspond to the size of the rocker (choosing an M board when choosing an M rocker).