No Residue after 60 Days: Adopt upgraded PET material. Smooth surface ensures fluent writing and easy erasing every time. The marking on the dry earse paper can wipe cleanly without any residue even 60 days later. Super Sticky White Board Roll: Adhere very well to any smooth surface like metal, plastic, glass, chalkboard, white board, steel. Each roll of white board paper measures about 4x6ft (LxW). It is unsuitable for uneven or rough surface, textured wall, embossed wall, painted wall or bumpy wall. (Please let us know if you are not sure whether it fits for your wall or not.) Easy to Install: Simply cut, peel and stick to your surface. Before installation, please clean the wall surface with a clean towel and make sure the surface is dry. After sticking the white board paper, please wipe it vigorously with a dry towel competely, which will help it adhere better. It is recommended that two or three people to complete installation work for a big perfect whiteboard. A Life Saver for Office/Home/Classroom: Are you still bothering the expensive and space-consuming traditional whiteboards? Are you still troubled by the messy and stains on the wall by kids doodle? Are you still troubled by the annoying chalk dust? Nortix peel and stick white board paper can solve all your troubles. Quality Promise: Nortix is committed to providing customers with quality products and services. If there is any problem about product, please feel free to let us know. Nortix White Board Sticker, White Board Roll, White Board Stick on Wall, Dry Erase Contact Paper Stain-Proof Dry Erase Wall Decal, 1 Piece (4x6ft)