Depending on your surface and other preferences, you can choose from - Foam Adhesive Strips: All Sliding Door Signs include high-bond foam adhesive strips for quick, permanent, and firm installation. These double-sided foam strips work well on clean and dry surfaces. If the surface is dirty or porous, the bond will not work well. Hook and Loop fastener strips (Velcro): 0.75-inch x 1-inch velcro strips are a clean option for those looking to change the position of their slider sign after installation. If rooms change regularly, you can easily take off the sign from the door and relocate it to a new location without any mess. Magnetic strips: 0.75-inch x 1-inch magnetic strips are a great option if the signs need to be relocated or replaced. However, the bond is not as strong, and therefore, magnetic strips are recommended for static surfaces and not for moving surfaces like doors.