Sterilization Instruments Tray with Double Silicone Mat and Large with hinged lid. Stainless Steel material. A stainless steel sterilizing tray designed to protect a set of ultra-fine microsurgical instruments during sterilization, storage, and transport. A soft autoclave double silicon mat accommodates various instruments. Pegs keep instruments in perfect place. Lid and base of case, and silicone mat are perforated with holes are to facilitate rapid drainage of fluid after rinsing or steam sterilization.