The Dayton Parts Trailer Leaf Spring has a spring width of 4.00" and 10 leaves. This leaf spring provides reliable support and stability for heavy duty trailers. The spring pack thickness of 4.50" adds to its durability and strength, ensuring that it can handle frequent use and heavy loads without breaking. This Trailer Leaf Spring is also designed with a lack of bushings, which reduces maintenance requirements and saves time and money in the long run. If you're looking for a high-quality leaf spring that can handle even the toughest jobs, look no further than Dayton Parts. FleetPride is your First Click in Heavy Duty®.