If you expect to see some heavy hitting robot on robot action this year, these bumper boards have a well developed bumper wood joint that will hold together through the impacts. The bumper boards are CNC routed Baltic Birch, 18 layer, super straight, 3/4" plywood. They have an interlocking pattern that allow for alternating screws and large wood glue surface area. Full bumper wood kits include Titebond II wood glue, and 24 #6 1-5/8" wood screws. Bumper wood is sized for an inner square of 30.125 x 30.125", leaving room for tucking in fabric on a 30x30" robot frame.