DuroBall bushing assembly offers precise location and control with excellent articulation and NVH characteristics. The Duroball Technology Features: - A unique metal and polyurethane hybrid design for demanding applications- The core strengths of SuperPro polyurethane coupled with a specialised metal spherical bearing - Super tough metal poly hybrid design - More precise steering and handling All the articulation benefits of a vertical pivot solution with greater positive location and durability. Grip Dynamics options with EXTRA positive caster