Install interlocking foam Profile Boards with matching Connectors to make a sturdy layout perimeter that can easily be cut with the Hot Wire Foam Cutter or a hobby knife to conform to any profile desired. Profile Boards are used around the perimeter of your layout to define the contours. Their special interlocking design allows them to be placed end to end or stacked and locked together. Each Profile Board is 8in high and 24in long. Comes in a set of 2 foam boards and 2 foam connectors.