New old stock vintage Tretorn brand of Sweden, a 3 pack from the 1970s.. this box is unopened and of course the balls have not been used… Tretorn was famous worldwide for their pressureless white tennis balls since 1955.. I have a few other unopened boxes of these also listed so feel free to see my other items and we can be fair with shipping.. I kept an open box that I found with these and they were still like new, supple and bright white! .. please see pictures for details and condition