Bearing 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 resistance to water intrusion Provides unsurpassed rust and corrosion protection Factory-Links ball bearings are specially designed for Off-Road use. - Ducati Monster 600 (1995, 1996, 1999, 1994, 1998, 1997, 1993); Ducati Monster 800 S I.E. (2003); Ducati Monster 900 (1997, 1993, 1998, 1994, 1999, 1995, 1996); Ducati Monster 400 (1995, 1996, 1997); Ducati Monster 750 City Dark (1999); Ducati Monster S2R Dark (2005, 2006); Ducati Monster 750 (1997, 1999, 1996, 1998); Ducati Monster 750 City (1999); Ducati Monster 800 Dark (2003, 2004); Ducati Monster 800 (2004); Ducati Monster 750 Dark (1999)