The Presso Side Knock Mechanical is uniquely designed to optimize the amount of pencil lead and eraser that can be fit in one mechanical pencil body. The pencil was designed so that the lower half is just the right length to fit pencil leads, while the top half is entirely filled with an extendable eraser. It makes so much sense when you think about it, because in normal pencils the top half of the pencil body is wasted empty space.
The side button is located higher up on the pencil body so it doesn't interfere with your grip of the pencil. Presto! You can extend lead with a convenient click of a side button. Plus, the pencil comes in six beautiful see-through colors including green, blue, orange, pink, soft blue and yellow. To refill pencil lead, pull off upper white portion of body.