Have this 1/4 in. (5.0mm) x Underlayment delivered to your job site. Handy panels have a smooth surface and are perfect for small repairs, and craft projects. Panels can be finished with paint, stain or polyurethane. Handy size means less waste and an economical price. easy to transport, manageable size will fit in most vehicles. 5.0 mm x 4 ft. x 4 ft.. Panels can be used for multiple projects..