Hook and hook interlocking system that does not sag over time.| Stays on strong. Comes off clean. | Whatever your style, Command™ Picture Hanging Strips make it easy to transform your space and make it your own. Forget about nails, screws and tacks, Command™ Picture Hanging Strips are fast and easy to hang – no more holes to worry about.| Strips ‘snap’ and lock together, providing a secure strong hold. Using the revolutionary Command™ Adhesive, they hold strongly on a variety of surfaces, including painted walls, wood, tile and more. Yet, removes cleanly - no holes, marks, sticky residue or stains.