A Pen gun is a firearm that resembles an ink pen. They generally are of small caliber (e.g., .22 LR, .25 ACP, .32 ACP, .38-caliber, etc.)and are single shot. Early examples of pen guns were pinfired, but modern designs are rim or centerfire. Some pen guns are not designed to fire regular cartridges,...

A tennis ball is a ball designed for the sport of tennis. Tennis balls are fluorescent yellow at major sporting events, but in recreational play can be virtually any color. Tennis balls are covered in a fibrous felt which modifies their aerodynamic properties, and each has a white curvilinear oval c...

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