Sealing ring X-ring Quad ring XR 0 - 99 mm NBR | eBay
XRing vs ORing Motorcycle Chain | ChapMoto.com
Metric Buna O-rings 120 x 3.5mm Minimum 2 pcs - OringsandMore
Order O-Rings Quick and Easy X-Ring Seals Rubber Washers
Modern O-Ring and X-Ring chains DO NOT NEED LUBRICATED! ONLY CLEANED! I am prepared to die on this hill, but please, hear me out first :) : r/motorcycles