material: it is made of High quality material, all materials are and 't easy to break, the easy pull button 't crack easily; This product has a long service life and the elastic silicone holder can hold the pen tightly, no matter what size the pen is. Save time and money: retractable pen holder can easily clip on clothes, belts, pockets, backpacks, or anywhere you like; You can use pens and pencils flexible and you don't have to worry about loosing them and they can easily retract when you finish using. Wide applications: great for doctors, woodworking, , or some people work on the roof; These people always need pens with them during their work time, and using this retractable pen holder is no need to pick up and put down repeatedly, they're also practical tools for students and teachers.