Material: Made of wood and solid graphite, practical and reliable, not easy to break and deform Useful sharpener: Made of ABS plastic and manganese steel, light in weight, small in size, waterproof and not easy to deform Retractable pen holder: The retractable pen holder is designed with a silicone pen cover that is durable and non-slip easy to use：Just fix the metal clip to the apron or belt loop, and insert your marker into the rubber joint; Connected with 24-inch retractable cord, you can mark easily without taking off the pen SIZE：With 7 inches long and 1/2 inches wide, can leave clear and visible marks for precision positioning