13Pcs Pencil in All: This set includes three 6mm mechanical graphite pencils, which are enough to meet your daily needs and replacement. You can share them with your classmates and friends. 2The Specification: The size of each mechanical graphite pencil is approximately 6 x 0.47 in, that is, 12 x 2 cm in length and diameter, the appropriate size makes it easier to grasp, carry and store in a bag or schoolbag. 3Attached Sharpener: Each mechanical graphite pencil has a built in pencil sharpener, which can keep the tip of the pencil incisive and accurate, thus helping to draw accurate lines and assisting your sketch work. 4Comfortable to Use: These pens are composed of pen holders and mechanical parts, which are comfortable to hold and easy to write. Their stable pen holders can protecting your hands or sleeves from the damage of graphite. 5Wide Application: The automatic mechanical graphite pencil is simple to operate. It can be favored by children and adults. It is suitable for school, classroom, office, family and party supplies, bringing you a happy and thoughtful learning and working experience.