This 15 ball set is one of the most unique billiard balls on the market today. Each ball features a beautiful granite appearance, yet carry the same high level of quality you’ve come to expect with Aramith balls. Aramith balls feature: – Perfect roundness and balance – Uniform weight and hardness- Brilliant colors – Friction resistant roll. 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 after 400,000 hits, whereas others were rendered unusable.