These Dr. Grip Play Border Shaker mechanical pencils from Pilot feature a unique shaker mechanism that can extend the pencil lead with a shake of your hand! You can also extend the pencil lead with the top knock button， which covers an included eraser. As a bonus design feature， these special pencils have a grip that contains three separate colored pieces that you can rearrange at whim. Simply unscrew the pencil's nose cone and carefully remove the inside pencil lead tube. You can then slide off the outer rubber grip piece and rearrange the inside stacked pieces however you please! The pencil also contains a plastic insert that can be removed from the pencil body， decorated， and reinserted to make your very own personalized pencil. Pencil body also features a loop for you to attach a cell phone charm， or thin lanyard key chain. Several colors available.Pencil dimensions: Approximately 5.6 inches (14.2 cm) long， and 0.5 inches (14 mm) in diameter at widest point.