Bearing is packed with heavy duty premium marine grease and with the addition of special complex thickeners which allows it to be virtually waterproofTo further help keep any moisture out, we have gone from 30% grease filling to a 60% for harsh conditionsDINP6 - ABEC3 Ball bearings with specially designed Factory Links seals Provides unsurpassed rust and corrosion protectionSingle row deep groove ball bearingDouble rubber sealFor off-road use.