Command Picture Hanging Strips have a unique design which attaches to both your frame and wall before clicking together to hold firmly. They are a great way of displaying photos and artwork around your home or office without damaging the wall. The pack contains 8 medium sized strips. Medium strips are designed to hold frames measuring 18 x 24", or up to 5.4 kg when you use 4 strips. You can easily hang your frame simply by clicking the 2 strips together. The hooks are designed for use on most walls and will remove without damaging your paint. The strips adhere to the back of your frame and also to your wall.