UM! Brands Hook Um! is powered by everstik nanosuction. Now you can place this hook almost anywhere and hold up to 10lbs. No adhesive tape, glue or tools required. Works on most non porous surface: tile, plastic, wood, cement, glass, metal and non-textured drywall. To maximize adhesion, use on a clean and smooth surface. Dirty or uneven surface may cause the product to fail. If the adhesive backing gets soiled, wash gently with water, air dry, then reuse normally.