This movement tray is composed of 2 layers of 3mm MDF. The tray holds 2 rank of 2, 15mm round bases. The dimensions of the movement tray is 40mm by 40mm. The spacing between bases is minimal to conform with rank and file games. The base cut outs are slightly larger than the base size to allow for extra paint or material that may be on the base. We use high quality MDF which does not warp when primed, painted and decorated to match your base design. The tray comes unassembled and requires either wood or super glue to assemble.