While less wear-resistant than the Super Aramith sets, the Aramith Premier sets still offers a lifetime up to 5 times longer than the other materials. Each ball is controlled along 7 criteria : density, balance, diameter tolerance, sphericity, color, surface polish and brilliance. All numbers are engraved to very tight specifications. Each Aramith ball is 100% "cast-phenolic resin". On the break, the cue ball reaches 20 miles per hour in a fraction of a second causing surface temperature to easily reach 482 degrees Fahrenheit! Aramith's molecular structure is engineered to withstand these temperatures making Aramith balls far less vulnerable to burn spots, resulting in minimal ball and table cloth wear.