HD Switch Front Wheel Rebuild Kits Includes 4 Taper Bearings Cup and Cone, 4 Seals with Garter Springs and Bore Sealant Coating Upgrades and 4 Spacers. The Garter Spring "Spring Loaded" Seal Applies Continuous Inward Radial Forces on the Spacer. This Keeps the Grease In and Water, Dust and Dirt Out. The Same Technology as Trailers, Cars and Other Demanding Applications. The OEM Seal Does Not Have Garter Springs or Bore Sealant Coating. The HD Switch Wheel Rebuild Kit is a Huge Upgrade and Will Provide a Much Longer Life.