Originally designed with 3D-work by Seamax Marine back in 2011, Now it is the 2nd edition released in 2019. Seamax Deluxe Boat Launching Wheels system is made by the marine grade T6 aluminum alloy with CNC processing and shiny looking anodized coating against the corrosion. Thus the product is good for saltwater use. Small parts are all made by solid stainless steel and reinforced Nylon. The air-filled tire is lab-tested (1000 LBS), and is great to support a MAX loading of 600 LBS in all condition. A great add-on for inflatable, aluminum, and fiberglass boats.