The 3M Command Decorative Clips are for effective damage-free hanging indoors. They hold strongly to a variety of surfaces, including solid, hollow, and painted walls, as well as other materials like wood, tile, metal, and glass. They're easy to apply and remove, leaving no holes, marks, or sticky residue. These clips are perfect for hanging items in bedrooms, living rooms, or offices. They're also great for renters who don't want to damage their walls. The clear design makes them blend in seamlessly with your décor. Each pack contains 40 clips.