STRONG & LIGHTWEIGHT POLYSTYRENE (PS) PLASTIC: This space age material is stronger and more durable than many other resin compounds and is considered the lightest among all major plastics ENVIRONMENTALLY FRIENDLY & RECYCLABLE: Polypropylene is more environmentally friendly than some other plastics. It's recyclable and doesn't release as many toxins as plastics such as PVC. SUPERIOR DIELECTRIC INSULATOR STRENGTH: Polystyrene has one of the highest electrical insulating strengths from all polymer plastic, ensure the safety and longevity of your equipment with PS! RUST PROOF PC PLASTIC: All components including screws are made from strong resilent and rust proof PVC plastic allowing for outdoor and in ground use