They improved them a lot! If your question would be more specific, it would be easier to answer. The tennis balls used to be wads of hair or wool wrapped in stuff, but now they are more rubbery for bounce. I don't know exactly how.
The pressure in tennis balls has been reduced and the size of tennis balls has increased to take away some of the advantages derived from modern rackets, which enables players to generate tremendous power without extra physical effort.
Old tennis balls have been used before, causing them to be worn in. New tennis balls have never been used before and easier to play with. It takes experience playing tennis to be able to tell the differences in old and new balls while playing. Otherwise, you can just tell by sight. New tennis balls are a very bright neon color and very firm, where old ones are darker in color and usually have less fuzz on them. Older tennis balls may also be slightly deflated.
Tennis balls are hollow. The skin made out of two hemisphere bits of rubber and two dog boned shaped fur, which help make the ball more aerodynamic.
6 new balls at each change over.
For every tennis match there maybe 60 balls needed
tennis balls are furry and raquet balls are not . tennis balls are also bigger.
New tennis balls are considered fresh and not "flat". Old tennis balls exposed to play and air become flat and do not perform normally in a match.
To play tennis, basically all you need is a racket your size, tennis balls, tennis court shoes and tennis balls. Very Simple.
The Stars' Tennis Balls has 388 pages.
Tennis Balls
Slazenger tennis balls are used at Wimbledon.
Yes, as a matter of fact donuts eat an average of 10,000 tennis balls per year. So tennis balls are the prey of donuts. Tennis balls are now extinct and are only made in factories.
To play tennis.
Yes there are many tennis courts in England.
tennis balls usually come in the colour of bright yellow. it's basically the usual color tennis balls are seen as.