The o-ring roller chain normally has a longer life span over standard roller chain. This chain uses a premium quality o-ring between the two link plates to seal lubricant in the "bearing" are of the chain. On top of holding lubrication in, the o-rings also help keep abrasive material out of the chain joints to prevent premature wear. O-ring roller chain is perfect for any applications where re-lubrication can be difficult or in dusty environments. We recommend that you periodically lubricate the chain to prevent the o-rings from drying out and cracking.