What makes Andersen Hitches plastics so durable?

All of our 'plastic' products are manufactured from a specially formulated, High Density Polyethylene (HDPE).  
HDPE is a rigid, high tensile strength product. It is extremely sturdy and resilient, has great impact resistance, is stabilized against UV light, and can handle cold and hot extremes. It also resists dirt, grease and oil.