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In general, a spacer is a solid material used to separate two parts in an assembly. Spacers can vary in size from microns to centimeters. They can be made of metal, plastic, glass, and other materials. Shapes include flat sheet, cylindrical and spherical. Two sizes of metal standoffs and one plastic standoff.
Throat guards can be made of metal, leather, and/or plastic, and may be built in to a mask or attached separately. The guard was invented in 1976 by Los Angeles Dodgers trainer Bill Buhler after catcher Steve Yeager was impaled in the throat by pieces of a broken bat .
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Also called a baseball cup, box, athletic cup – made of hard impact-resistant plastic or light metal, often with flexible sides for comfort and protection, designed to protect the testicles and groin from impact of a baseball, baseball bat, cleats, or any other moving object. Absolutely required for catchers, pitchers, and often all infielders.
The trampoline effect, which is common terminology for baseball players, is the phenomenon when the baseball "jumps" off the bat at contact. The bat-ball collision can be demonstrated from the physics of elastic collisions. The stiffer the barrel of the bat, the slower the baseball comes off the bat because it loses energy in the collision.
A bat's diameter is larger at one end (the barrel-end) than at the other (the handle). The bottom end of the handle is the knob. A batter generally tries to strike the ball in the sweet spot near the middle of the barrel-end of the bat, sometimes referred to as the fat part of the bat or the meat end of the bat.