l, thickness 3.00mm. 2. Internal limiters, no bump stops or crush points. 3. The joints' welding is at least 2/5-1/2 inch thick. 4. The bearings are made of cast steel with cast steel rollers, and do not require re-lubrication. 5. All pedals and stepping platforms are made of impact absorbing plastic for comfort and safety. 6. After fabrication and welding, all parts areanti-corrosive powder coated for rust protection. 7. All metal parts receive two layers (120-400 microns) of dupont powder coat. 8. An additional layer of polyurethane uv3 (450 microns) is applied to all metal parts for ultraviolet protection. Warranty: in light of the quality of our products and the manufacturing process, we are proud to offer a warranty: 15 years on all pipes, foundation and welding. 3 years on all moveable parts, plastic and rubber. One of the best warranties in our industry. For detailed information on our warranty, please see our catalog. Bubble plastic bag and pp bag