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. Create a gallery on any smooth surface with Home Sweet Classroom Clingy Thingies Motivational Gallery Signs. Each pack includes 20 pieces. 'Today' sign measures 16.75" x 2.625".