Acousta Stuf is a sound absorption, dampening fiber which will deepen bass, provide cleaner midrange and improve the dynamic extension of any speaker system. Acousta StufTM will outperform Dacron, foam, and fiberglass. There are no health hazards with Acousta StufTM and no mask or gloves are needed when using this product. Most sealed and vented enclosures require 1/2 lb. of dampening material per cubic foot of enclosure.