Before diving into any activity or assignment project, let students know what supplies they need with ease. All you have to do is stick these on the board. A useful resource to include in classroom supplies, these magnets come designed as a glue for laptop pencil calculator, and more. Teachers can use these class magnets as management tools to help give direction and keep young minds on task. Vinyl. (21 pieces per unit) 3/4 '' - 9 '' x 1 1/4 '' - 6 3/4 ''.