Lineco Body backing papers are acid-Unfastened and buffered with three% calcium carbonate to offer protection to the paintings. Average porosity permits the Body bundle to breath and the usual weight paper cuts cleanly and is definitely treated. Those papers will upload worth and differentiate the standard of framed paintings. Acid-Unfastened Buffered Body Backer Paper for museum high quality items. Protected and puncture resistant. Average porosity permits Body bundle to respire. Same old weight 40 lbs.