1910 in Jeannette, Pennsylvania
Penn or Wilson.
penn, because all the professionals use them.
penn
No difference. The numbering is present to distinguish the balls from other balls on court
penn. all the pros use penn tennis balls. anyway i did a test about which one lasted longer. i let them sit in my room and over time the penn bounced better than Wilson or dunlop.
Penn
Dunlop, Wilson, Penn, Prince, and Gamma are all name brands of tennis balls.
According to Gamma Sports the very first tennis balls were pressureless tennis balls and were created in the 1860's as a result of the recent discovery of vulcanization. It wasn't until 1922 that Penn created the pressurized tennis ball that we use today.
ellesse
The official match ball for the 2014 FIFA World Cup was manufactured by the Adidas company and named the Adidas Brazuca.
For a ball Machine, it does not change the kind of ball you would use if you were playing a tennis match. If you are a keen tennis player (plays more than 3/4 times per week) i wouldrecommend to buy Head ATP or any Slazenger but if you are just a typical player any unpressurised ball can be used with success.
a tennis ball