FACTORY LINKS bearings are packed with a heavy-duty premium marine grease and an additive of a special complex thickener that allows it to be virtually waterproof. It provides unrivalled rust and corrosion protection. * Also to keep out any moisture, we've gone from a 30% grease fill to a 60% for harsh conditions.Our FACTORY LINKS ball bearings have been specially developed for off-road use, unlike industrial 2RS ball bearings, which offer low torque resistance and therefore low resistance to water ingress. | Article: Factory Links Wheel Bearing Kit