The tin material is made from the high quality Japan made steel plate and paint, followed by antirust coating, and the excellent paint technology. High heat oven comes out with the perfect product. Due to the highly calculated compressor, leaves zero stretch marks, which often occur from overstressing the metal. Product variety and quality is guaranteed no matter what. All ingredients are from within Japan; leaving no strange odor inside the container, airtight shut to always keep the humidity inside the container at the right level.