A method for manufacturing a glass stamper includes the following steps. Each local resonant cell group comprises a plurality of resonant cells that are small relative to a first wavelength of electromagnetic radiation that is incident upon the composite material. A locking member of the trigger lock mechanism normally has a blocking relationship with the trigger that prevents an incidental force applied to the trigger from opening the valve. Fastening elements detachably couple a fourth edge of the second cover section with a first edge of a first cover section to form a closed loop around the seat or the back. The magneto-optical recording medium includes an in-plane magnetization-inducing layer principally made of cobalt on the auxiliary memory layer. In addition, an antimicrobial material is disposed on the belt cover, and is formed of silver nanoparticles embedded in a polyurethane film having a thickness of \u02dc0.