Check the listing for details. Sholder Tooling Ball: 3 each 1/2" 6 each 3/8". Condition: Used. Listed at 140.00 USD. Again, I don't know how I came in possession of these tooling balls. I do know that I don't need them. The tooling balls appear to be in very good shape. Though serving a tool Maker apprenticeship (at GM's AC Spark Plug in Flint, MI) sixty years ago I never used a tooling ball. Though I worked on B&S CMMs for a year, I have no idea how I acquired these. They appear to be similar, I don't know the manufacture(s). The shoulders are of different thickness (see photos).If you would like to buy a single ball I will sell one: please make a reasonable offer (take in consideration that I am paying shipping). If one is sold, I will editit this listing. I plan to pay for shipping in the US and have always shipped within two days of purchase. I will refund money if the items are not as described. Please feel free to ask any questions about the listed item.