Our plastic lumber is a solid, non-hollow foamed recycled product made from Recycled High Density Polyethylene (ReHDPE) plastic. Common HDPE (recycling code # 2) products are gallon style milk, water and juice containers, as well as some detergent and shampoo bottles.Our plastic lumber is 100% plastic with no wood fillers to rot, peel, weather or blister, and generally contains over 90% recycled HDPE plastic material.