Auralex 4-Prong Flat Impaling Clip for mounting foam and fiberglass acoustic panels. Impaling clips 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.