Impaling clips, are included as standard hardware with all ProPanel products and can be mounted to the wall using standard drywall screws sold separately. They allow for quick and easy panel placement on virtually any surface. Use impaling clips alone for panels in low-traffic areas or when temporary mounting is necessary. Combine impaling clips and TubeTak Pro adhesive when permanent mounting is required. See specific dimensions below. Creates an air cavity behind the ProPanels for improved low frequency absorption Wall applications only 1 in. and 2 in. offsets available