Tiger mja-a bottles are produced in japan with the highest vacuum insulation quality. The double wall insulation will keep your drinks hot or cold for hours. A copper sheet between the inner bottle and outer enclosure reflects temperature to boost retention for hot or cold beverages. Our stainless steel products are made of sus304 (18/8), known for its excellent corrosion resistance and long-term use. - vacuum-insulated stainless double wall - compact design - light weight - easily washable with wide opening - keep hot / cold - made in japan