Variety of Colors: you will receive 4 colors of engineering pens, the color includes black, green, brown, blue, while including 5 boxes of engineering refills, refill colors include silver, black, red, yellow, a total of 60 refills, enough to meet your daily use needs Practical Design: the drafting pencil is made of reliable plastic and metal materials, not easy to rust or break, sturdy, can be applied for a long time; The grip part of the pen using the striped design, non slip and smooth grip Size Information: the engineering pen is 15 cm/ 5.91 inches in length, with 2B or HB refill, the refill in the kit is 2 mm/ 0.08 inch, length about 12.5 cm/ 4.92 inches, easy to use; You can choose different color refills for marking according to your different marking needs Practical for Using: this woodworking machine pencil is easy to use, the engineering pencil is self pressing so you can use it whenever you want, and it comes with a pen clip for easier carrying Wide Range of Application: It can be applied to woodworkers, architects, designers, students, office workers, etc., and can be applied to mark wood, metal, tile, paper, cement and other flat surfaces