For effective damage free hanging of string lights indoors, use Command Decorating Clips. Command strips hold strongly to a variety of surfaces including solid, hollow and painted walls, as well as other materials including wood, tile, metal and glass. Theyre easy to apply and remove, leaving no holes, marks or sticky residue. Suitable for any room in the house or office. Value Pack contains 40 decorating clips and 48 Command Strips 3M CLAW Command White Decorating Clips Value Pack