Our Rectangular boards are made from hard plastic. Note that the boards do not interlock unless piled correctly (You cannot fit the boards together turned 180 degrees).
There are two models of Rectangular boards.
One model (to the right) where the score-sheet can be clipped on the back of the board (or put in the slot on the front).
The other model (below) does not have the clip, only the slot for the travelling score-sheet.