For well over a decade, SKF TF Hubcaps have helped fleets log literally billions of trouble-free miles. Engineered of DuPont Zytel, SKF TF Hubcaps are lighter than steel and stronger than aluminum. A cloud-free window is fusion-bonded to the hubcap body during the manufacturing process, eliminating screws to shake loose and potential leak paths. Additionally, a solid aluminum ring is embedded into the hubcap's base, helping to distribute an even, leak-proof load against the hub. Each hubcap includes plated, pre-assembled retention bolts (at no additional cost), designed to protect against leaks at the bolt holes.