The tennis balls are swollen, felt covered rubber balls of about 2.7 inch tennis ball diameter.The normal color is yellow, but it may give the impression of nature. History fluorescent green due to the changes in BallsEarlier Tennis, tennis balls are a wide variety of materials such as leather and stuffed with wool or hair on the belly of a sheep or goat, wrapped in wool and tied with cords of rope wood pine made from the intestines and muscles of animals, however, modern tennis ball seems to come directly from the wool century.Strips 18 (3 / 4 inches long) were wound tightly around a nucleus composed of a rope tied around the ball cork.Then after it was covered and sewn with a white ball with a cork base covered with fabric and cloth.Tennis is still used in the original court, now known as tennis balls are The Royal Tennis. Modern vulcanized rubber (hard rubber with sulfur), a compound that is very durable and solid, with the right consistency.The most expensive ingredient of a tennis ball felt, which can be adjusted in different ways to change the ball increases nap and it makes sense properties.Steaming fluffier.This substance increases the wind speed and ball control, while reducing the nap speed.A a rebound and compact tennis to advance to hit the tennis racket or ground.Types BallsThe the two main types of tennis balls are: BP – These balls have a hollow core, filled with nitrogen pressure. The last about a month after the ball is "dead". No pressure – This type of tennis ball has a solid core and is suitable for the same training easily.However Game.The the ball does not lose its bounce, it is likely that the feeling will soon disappear. Some other types of tennis balls are regular duty tennis balls – they are intended for use on indoor courts and clay. Extra duty tennis balls – These should be used on lawns and concrete courts.If used tennis in clay, the ball can be very confusing. Tennis balls at high altitudes – are used in high altitude areas like Denver, where the earth is 4000 meters or more above the sea have balls bounce higher level.Regular.