... Viscous theoryFive characteristics:1. Eco-friendly, it can reuse, and no mark left2. Practical, easy to use, super strong ... No drilling.3. Washable.4. Easy to take down and stick on.5. Can be advertising gift.6. Save money ... don`t dangle the mirror,wall clock,glasswork and other valuable or breakable goods.5.Do not ... as painting wall,wallpaper,cob wall,sand wall and flowery tile wall.7.The hook can be ...