EcoTouch PINK FIBERGLAS thermal insulation with PureFibre Technology (often called "mineral wool"). Inorganic insulation made of preformed fibreglass batts. Frequently used to insulate walls with 3-5/8 in. (2 in. x 4 in.) steel frames and with a centre distance of 16 in. Batts maintained by friction. Easy to install. Non-combustible, mould-resistant, and made of over 70% recycled content.