Each pack contains 1000 sheets of %100 virgin PTFE terp proof squares. Enjoy! As the extraction industry continues to evolve and increasing amounts of corrosive aromatics are being preserved, non-reactive packaging is now necessary for health and safety reasons. Silicone-coated parchment paper is reactive and will disintegrate easily into botanical oils, contaminating and damaging your extract. Pick up a pack of PTFE extract packaging squares today and preserve the purity of your botanical solutions!