Table Tennis Balls:
Table tennis balls are now constructed from two main materials: plastic or celluloid. The main reason for the creation of plastic balls, which play very similarly to celluloid balls, was to create a product that was more environmentally friendly and as of July 2014, all ITTF events have used plastic table tennis balls.
Table tennis balls come in 4 different qualities: 1 star, 2 star, 3 star and training ball quality. The 3 star table tennis balls are considered to be the highest quality with more uniformity of shape and bounce, better durability and seamless construction. These are the quality of balls used for ITTF play. 1 star, 2 star and training balls are generally more economical but may vary in uniformity of shape and weight and may be slightly less durable.