GeckoTech Reusable Hooks are made using revolutionary Micro suction technology that allows them to be used again and again. GeckoTech suction-cup hooks are great on glass, painted surfaces, laminate, stainless steel and most other flat, sealed surfaces. GeckoTech hooks are waterproof after application and can be used in many different areas, including bathrooms. No tools needed to install or remove. GeckoTech hooks remove without damage and do not leave any residue.