Irving Kaye offered a full line of Foosball replacement parts and among the items listed in their catalog were the Irving Kaye Foos Balls. These hard plastic balls were originally made for their Super Soccer tables. Pictured are the #114 high visibility bright yellow balls that feature an engraved volleyball-style stitch pattern with an the Old English K and Chevron Irving Kaye logo.
These can be seen on page 2 of the 
Irving Kaye Soccer Parts Catalog No 13
Thank you to my friend Keith for letting these 5 little gems go from his Irving Kaye collection!