TsengChien Vacuum Cup Thermoses 500ML Food Grade Insulated Stainless Steel Mug Coffee Tea Mug for Travel Keep 24 hours Double Copper-plated stainless steel vacuum insulation keeps beverages hot or cold for 24 hours. Anti-fingerprint,prevent slippery absorb sweat function Compact design takes up minimal space while maximizing capacity Durable and Food grade 304 stainless steel interior create a smooth and ultra-clean stainless steel environment for your drinks. Scald-proof design, food-grade silicone seal and PP lid.