They are manufactured to meet or exceed industry standards, the company says, and are made with the highest quality steel and components. The leaf spring line is made in North America and includes more than 75 all-makes part numbers. They are produced from alloyed steel that is formed, forged, threaded, or heat-treated for a variety of applications. All TRP products come with a two-year nationwide warranty. Customers can choose from over 130,000 part numbers across more than 100 product lines available through a network of 2,265 authorized retailers worldwide.