This upgraded version of the classic Tombow Mono Graph Shaker mechanical pencil features a durable metal clip and rubber grip section. The shaker mechanism allows you to extend the lead by simply shaking the pencil up and down. Push up on the clip to lock the shaker mechanism to prevent the lead from accidentally extending when not in use. The clip is also a click mechanism that can be pushed down to extend the lead by pushing down on it. A Tombow Mono eraser can be extended from the top using the twist mechanism.