Experience the Mono Graph Mechanical Pencil's innovative, shake-lock mechanism! Just shake it to extend the lead and twist the eraser to use it - writing has never been smoother or more effortless. The fixed guide pipe prevents lead from breaking and the lightweight yet sturdy barrel is made for a comfortable grip. With pre-loaded 0.5 mm hb lead and your choice of three body colors, this #1 selling pencil is ready to make writing more enjoyable!