Features: and First you should clean the surface with a dry cloth which you will stick on, then peel the viny circle off of the white backing gently, next place the center fold of the circle onto the table and relase each side down at a for time slowly. Finally you can write on the dots. Great for marking areas of learning for students, also you can use these on the ground for party decorations and they worked on our floor. And they are easy to apply to any smooth surface for a long for time. Including 12 pieces self-adhesive message board. There are enough space for you to write notes, and it 's not easy to have bubbles when you post to make sure it can stick more for stronger. Self-adhesive message board can be used on classroom floor to help children line up, and they can be wall sticker for kid to brighten up their room. A fun way to encouraged them write more - even the kids who were hesitant to write, preferred to write on these erase circles because they could erase their mistakes easily and start again. Self-adhesive message board made of PVC, it is waterproof and easy clean with whiteboard marker writing on. Also it can easily be erased with a eraser or tissue, because they are easy to remove, this made it easier for them to work with other books, tools, clipboards, etc. Specifications: Material: PVC Diameter Size: Approx. 28cm/ 11.02in ; 30cm/ 11.81in Note: 1. Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 12pcs Colorful Self-Adhesive Message Board Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.