Medical Grade Self Seal Pouch is made of high-quality materials, IE 60 GSM Medical Grade Paper (MGP) sealed on 3 sides with Multilayered 56 GSM Laminated Cast Poly Propylene (MLCPP), to withstand the high temperatures and pressures of sterilization processes. The fourth side comes with a self adhesive tape, which can be self sealed once theproduct is inserted in the pouch.