Episode PRO Series Sound Dampening Barrier is a GREEN Ethylene Vinyl Acetate (EVA) product made from Post-Industrial Recycled Automotive Products with No PVC (no ozone depleting gasses), sustainable, flexible for easier installation. Lowest cost Sound Control Solution to meet building codes. Significantly reduces airborne noise up to 75% with a STC rating of 41 on wood studs 16" on-center and a 56 STC rating on metal studs 16" on-center with R-13 installation.