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 balls feature:- Perfect roundness and balance – Uniform weight and hardness – Brilliant colors – Friction resistant roll and reaction. When you make an investment in Aramith balls, you can be assured you are getting one of the highest quality ball sets on the market. 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.