★ Simply place it in your lunch box. Antimicrobial sheet to inhibit bacterial growth ★ Silver ions are kneaded into the film to prevent the growth of bacteria adhered to food. ★Size: 2.4 x 3.9 inches (6 x 10 cm) ★ Pack of 30 ★ Microwave and oven safe ★ Heat resistant up to 282°F (130°C), Cold resistance / -50°C; Material: Polypropylene (silver inorganic antibacterial additives) ★ Made in Japan ★ Launcher / Sun Art Co., Ltd. *Silver ions are safe to human body without leaching out. Does not work on products that have already been contaminated. Please do not reuse. Please check the notes on the back of the product before using.