Features:Perfectly rounded, suitable for competition, training.Uniform roundness produces reliable bounce and high durability.Very similar to the bouncing of a traditional celluloid ping pong ball.It has the characteristics of high uniformity, stable rotation, fast speed and good balance.Specification:Material: plasticSize: Boxed: 12*4*4cm, single ball diameter 1.57in/4cmcolor: WhitePackage Includes: 3pcsNotes:Please allow minor errors due to manual measurement.The colors may be a little difference for the different monitor display.