FACTORY LINKS BEARING KIT WHEEL FRONT & REAR KWK-K-001Bearing is packed with heavy duty premium marine grease and with the addition of special complex thickeners which allows it to be virtually waterproof, Nitrile butadiene rubber double lip oil seals help prevent abrasives, corrosive moisture and other harmful contaminants from entering bearings, To further help keep any moisture out, we have gone from 30% grease filling to a 60% for harsh conditions, The special v groove on the inner race is better for