Tennis Balls
Tennis balls are famous not that much because of the sport as thanks to their bright look that gets them spotted in a second. They are yellow, pistachio green or orange and the common diameter is 2.7 inches or 6.7 centimeters. Like in football, balls are recognized by kids and adults alike and they are often part of children's games that have nothing to do with as such. The balls and the rackets remain the key elements that create the essence or the basis of any game, although depend on other gear items too. Tennis balls have come a long way before reaching the present day form. Back in the old days when was invented and played first, these balls were manufactured from leather and materials like wool and hair were used for stuffing them. These old balls did not bounce the way modern ones do, but people enjoyed them all the same. The Scots are the ones known to have manufactured these balls initially; they would use animal human hair, animal fur or wool to stuff the round container made of leather and tied with animal intestines instead of rope. Although to a modern mind this sounds less than rudimentary, the initial users were far from the vulcanized

rubber balls we use today. The balls variant between the organic material and the vulcanized rubber was the rubber core ball which was introduced once people started playing this sport on lawn towards the end of the 19th century. Rubber is no longer the only material used in the design of balls. Chemicals added for rubber consistency are now widely used in the balls design. The blend actually represents 80% of the entire ball structure. One of its peculiar ingredients is the felt that determines the player's striking resistance and the wind. The felt also has an important role in controlling the bounce and the speed properties of the balls. There are two variants of balls: the pressurized and the pressureless. The distinction also has a great deal to do with the ball's bouncing properties. A pressurized ball will bounce more. The problem is that the bounce disappears in time. As for the pressureless balls, they increase in bounce and are considered more reliable. The more advanced the technology becomes, the better the properties of the balls used in this sport and in many others; and, as a result, the better the sport performance.