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When someone talks about an o-ring chain they usually mean a sealed chain. Some chains just have rollers that spin around the pin in between the side plates. O-ring chains have rollers that are sealed at the end and the roller is packed with grease. Many companies offer x-ring seals (where the cross section on the seal looks like an x instead of an o). The x-ring provides a better seal because it has multiple sealing points.
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