Overview The Race and Ergo Ultra pads are available in two thicknesses 5mm and 10mm allowing riders to tune the diameter for a snug fit. New foam that resists being crushed for longer periods of time. Improved surface durability. Superior grip with a molded in textured surface. Compatible with both the Ergo and Race armrest kits. Tech Specs Dimensions :  Race (92.9mm x 887.5mm) or Ergo (108.4mm x 87.5mm) Stack: Â5mm or 10mm Compatibility:Race / Ergo Weight:  5mm: 21g / 10mm: 37g Manual Race / Ergo Armrest Kit Installation Instructions