3M Command 20 Lb. Black Picture Hanging Strips, 4 Pairs provide a strong and damage- solution for decorating your space. These extra-large strips are designed to hold frames up to 24" x 36" and lock in place to keep items level and securely mounted without the need for nails, screws, or tools. I for gallery walls, mirrors, dorm rooms, and more, these adhesive strips work effectively on a variety of indoor surfaces including painted walls, concrete, and painted cinderblock. When it’s time to redecorate, they remove cleanly without leaving any sticky residue or causing damage. Model Number: 17217BLK-ES