from the rutply web site..
Sometimes refererred to by the generic name of COMPREG, DymondWood® is a highly engineered wood/plastic composite, that has the physical and mechanical properties of high density hardwood, acrylic, polycarbonate plastics and brass. Here, brightly dyed northern hardwood veneers are combined with engineering grade resins, heat and pressure to create a product that has the best characteristics of each. DymondWood® is distinguished by its unique strength, durability, dimensional stability, and weather and moisture resistance as compared to regular wood.