Number 15 replacement ball Made of Aramith Premier: Aramith phenolic resin with far better resistance longevity than polyester and other phenolic sets High quality standards for 8 criteria : density, balance, diameter, roundness, color, glossiness, hardness, weight Each ball is packed securely Made in Belgium Aramith Premier balls: the perfect compromise between quality and price. Made of Aramith Premier: Aramith phenolic resin with far better resistance longevity than polyester and other phenolic sets. High quality standards for 8 criteria : density, balance, diameter, roundness, color, glossiness, hardness, weight. Made in Belgium.