This Aramith Premium Belgian Billiard Ball Set includes 15 superior table balls and an Aramith cue ball. Each ball is made of premium resin with Vitrotech technology that hardens and vitrifies the surface for durable brightness and longevity. The smooth surface drastically reduces table cloth wear resulting in far less cloth and ball replacement. Aramith phenolic balls last up to five times longer than other balls made from polymers or polyester. Billiards-play simulators have shown that Aramith phenolic balls are still perfectly playable even after 400,000 hits, whereas others were rendered unusable.