Material: The pen holders are made of manganese steel which is durable, flexible with long service life and therefore they are not easy to get rusty and eroded. Adjustable buckles: The diameter of the spring loops can be expanded from 7mm to 18mm, you can use them to hold almost any size of pens or pencils with the useful pen holder. Practical design: These pen holders match your favorite laptop very well, and they are lightweight and easy to carry anywhere, which solves the problems that you often lose your pens. Wide Use: These pen holders are suitable for students, teachers, postal workers, doctors, nurses, pilots and other careers; They can be applied at home, school, office and also suitable for those who need to carry a pen at all times. Desirable gift: There are 6 pieces of pen holder clips, which are enough for your different needs, and you can share them with your family, friends and colleagues.