I’ve used these chains for years and purchased from Vanillabikes based on a really great price. They arrived quickly but were in plastic bags and not the usual boxes. Being such good value and in bags made me wonder if they were genuine KMC products. I emailed Kevin at Vanillabikes and he assured me they are. I have since found out OEM means Original Equipment Manufacturer. Kevin explained they buy the chain in bulk and chop it up into lengths of 112 links. This suits me as my bikes need lengths of 110 links. Vanillabikes also sell the ‘original’ boxed versions (comprising 118 links) for an extra £6.