Aramith "Premium" billiard balls: for the pros Aramith "Premium" billiard balls are top-of-the-range phenolic resin balls. The Vitrotech technology used hardens and vitrifies the surface - the result: shock resistance, longevity and long-lasting, beautiful colors. Protect your billiard cloth The smooth material of these balls reduces wear and tear on your billiard cloth. The balls are attractive with their bright colors and inlaid numbers. Billiard balls are manufactured according to seven quality criteria: density, balance, diameter, sphericity, brightness, hardness and weight. Detailed specifications: Material: phenolic resin / ø 57.2 mm /