It is the buyers responsibility to examine all items to determine if an item is safe for use - the buyer accepts all responsibility for use of items purchased
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Here is some bling for our bike - a Regina America Superleggera 12-19 freewheel. We can't tell if it's new and a bit dirty or if perhaps it was mounted. There are some marks on the cogs but other packaged ones we looked at had those too - so nut sure. It's a wide 6sp spacing. It's very light but with a steel body. The container doesn't have a label, but the freewheel has a single groove on the backside and other's we've seen in packages with the groove are ISO. So our guess is it's ISO. But in any case it will fit perfectly on a BSC threaded hub. Cogs are 12,13,14,15,17,19. You get exactly what you see in the photos.