Coverstock: The material that makes up the outer shell of the ball; the hardness, texture, and shine of a bowling ball. It is generally defined as Aggressive, meaning it is made of a high friction material that is prone to large hook or flip when it encounters dry boards; or, Medium which displays less tendency to hook; and, Mild/Mellow which is the lowest friction material and the least sensitive to dry lanes.

 

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Coverstock: The material that makes up the outer shell of the ball; the hardness, texture, and shine of a bowling ball. It is generally defined as Aggressive, meaning it is made of a high friction mater . . . View Full Definition

Urethane: A plastic blend that is normally softer and more porous than polyester; coverstock favorite until the advent of reactive resin.

Reactive Resin: A polymer that is a cousin to traditional urethane; used as the coverstock on most modern balls; it is generally a surface that grabs the lane sooner, resulting in more and earlier hook than . . . View Full Definition