From Chris Adams,
Your Guide to Ergonomics.
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Breakdown: Human-Machine Interfaces

The EzGrip ink pen's comfort grip is molded to form a ledge for your finger tip. With your finger tip resting on the ledge you do not need to grip the pen to provide the downward marking pressure.

The large, push button top activates the retraction mechanism. Unlike standard small diameter clickers, the large top provides a firm and comfortable seat for your thumb.

Ergonomic Breakdown: Comfort Factors

The EzGrip ink pen is incredibly comfortable in the hand. The comfort grip is one of the best on the market. And the finger tip ledge makes extended use of this pen comfortable as well.

Ergonomic Breakdown: Efficiency Factors

The EzGrip ink pen is a refillable roller ball pen that accepts the standard roller ball refill.

The barrel of the pen has a clip for easy storage and retrieval.

Use, Misuse & Unknowns

The EzGrip is a standard ink pen. It doesn't taking anything special to use it. It is usable by both right and left handers.