Poly Lumber Poly is a High-Density Polyethylene (HDPE), a multipurpose building material. Made from post-consumer and industrial recycled materials. These materials are melted down and formed into usable sheets. Our bird feeders are cut and routed from these poly sheets and then assembled into the final product like milk jugs and laundry bottles. High Quality Materials 15" L x 11" W x 9.5" H, Weight: 6 lbsDurable and long-lasting stainless-steel hardwareAluminum mesh floor for drainage and ventilationCovered roof for protection against rain. Angled roof allows rain to run offClear acrylic sides allow you to see seed level. Acrylic sides are also removable for easy cleaningHopper design funnels food down to the bottom openingsSuet cages on either side for added snack zones Heavy Duty and Durable Designed to last longer than traditional wood-based products. Lasts through many seasons and even years of use, vs. one season with traditional wood products. Low maintenance – requiring only mild soap, warm water, and a scrub brush to clean. Poly withstands outdoor conditions better than traditional wood. Be sure to give a thorough rinse before resuming use.