O-Ring roller chain uses and o-ring between the two link plates, which helps hold lubricant in the "bearing" area of the chain. Another great benefit of o-ring roller chain is the that it helps keeps abrasive material out. This chain is perfect for any applications where re-lubrication can be difficult. All o-ring chain needs lubricant applied periodically to help prevent the o-ring from drying out and cracking. Overall the o-ring chains will provide a longer lifespan than most standard roller chains.