Clingy Thingies® are made with a special cling technology. They are not sticky to the touch, yet they stick to any smooth surface and can be easily removed. You can even use water to rinse lint or dirt off the back surface. Clingy Thingies® can be used again and again without leaving any mess or residue. They also feature a write-on/wipe-off surface, perfect for notes, labeling, and reminders.Clingy Thingies® clips hold firmly to all smooth surfaces. Use to hold multiple papers or other objects throughout your classroom. Base measures approximately 3.125" in diameter. Write-on/wipe-off surface. Each pack includes 4 clips.