Ultra Strong Adhesive Hooks: This hook cannot be used on painted walls, painted doors, brick walls, limestone walls and wooden walls The self-adhesive hook has an extremely strong viscosity. 304 Stainless Steel Hooks: The adhesive hooks are made of high quality 304 stainless steel, which is sturdy, water rust and oil resistant. Easy Installation: No tools required. Just peel off the back protector and stick it on the smooth surface without damaging the wall. No drilling/squatting/drilling required.^ Common Application: The self-adhesive hooks are good for kitchen, bathroom, bedroom, office and household for hanging dishcloth, cup, pan, towel, bathrobe, keys, hat, clothes, Bags, umbrellas, photo frames, etc. Removable: They can be easily removed with a hair dryer using the self-adhesive hook. No traces of glue remain after tearing off.