Aramith 57.2mm Tournament Billard Pool Ball Set/16 Balls Standard size 2 1/4 inch pool balls Includes 15 beautiful pool balls with bright colors and bold numbers for ultimate visibility and 1 aramid logo cue ball Made with durable resin formulation, a hi-tech engineered molecular structure that enhances the longevity of the balls while minimizing significantly table cloth wear Exceeds up to 8 times the Lifetime of the average polyester and phenolic-like resin balls, reaching up to 40 years in residential use Produced with professional quality specifications of density, balance, diameter, roundness, color, glossiness, hardness, and weight