On the break, the cue ball can reach speeds of 20 mph in a fraction of a
second creating massive surface temperature, which can cause burn spots and
table cloth wear. The Aramith Premium Belgian Pool Balls
are constructed of Cast-Phenolic Resin, allowing them to withstand these high
temperatures thus minimizing burn spots and table cloth wear. These
premium quality 2 1/4" billiard balls feature the number in the stripe.