Alley Balls
The house balls that you find on the racks at your local bowling alley are mostly made of plastic (polyester). Polyester balls have been available since the 1960s and they are popular with bowling alleys because they are far less costly than your custom balls, but are much more durable.
Urethane
In the 1970s, bowling ball manufacturers began to experiment with bowling balls made of urethane. It had a softer surface than the traditional plastic balls, which made them much more effective when bowlers wanted to hook the ball. Urethane is good because it can be sanded and polished to provide more or less hook potential.
Reactive Resin
The 1990s saw yet another advance in the art of bowling ball manufacturing. Bowling ball suppliers found that adding reactive resin to a urethane ball gave the ball additional bite. Plus, when used in conjunction with the oil on the lane, the ball would hydroplane when it had reactive resin in it. This generated greater striking force when hitting the pins and the modern era ball was formed. Average scores have significantly risen in the wake of reactive resin bowling balls.
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