I,ve seen these spools before but never bought a set until recently when a person had several sets for sale on eBay. I asked them if they had any background info on them but got no ansewer back. My question is, who or what does P.A.I. (U.S.A.) stand for and what were they commemorating with CST (Ceramica Santa Terezinha) Brazil in 2004. The label on the box just says P.A.I.CST Commemeratives 2004 and New Jersey where I guess they were distributed from. Any info would greatly be appreciated. Take care To all.