Product Description The insulation supports are cut from carbon steel, spring wire for optimum flexibility and strength. Mitered tips dig into the wood, securing itself and insulation when installed between joists. 16" Made with 14 gauge wire Cut from carbon steel, spring wire for optimum flexibility and strength Mitered tips dig into the wood, securing itself and insulation when installed between joists Used to keep insulation place 100-pack. From the Manufacturer Keep your insulation firmly in place with the Simpson Strong-Tie Insulation Supports. The insulation supports are cut from carbon steel, spring wire for optimum flexibility and strength. Mitered tips dig into the wood, securing itself and insulation when installed between joists.