The very first tennis balls date back as early as the 15th century and were made of different materials, mostly from leather stuffed with human and horse hair or wool. The Scottish craftsmen used the stomach of a sheep or goat that they wrapped with wool and tied with a rope. Around 300 million tennis balls are produced each year and Yellow tennis balls were first used at Wimbledon in 1986.There are more than 200 tennis ball brands that have been approved by the ITF. The most expensive material when manufacturing a tennis ball is the felt covering the ball.The grand daddy of the FamiLane Collection, this premium T-shirt is as close to perfect as can be. It’s optimized for all types of print and will quickly become you favorite T-shirt. Soft and comfortable, durable and thick, this is a definite must-own and a FamiLane recommended product.