Premium stainless steel coffee mug made of food-grade 304 stainless steel.Non-insulated and conductive design for mug warmer, single wall and flat bottom could transfer heat promptly, cups can have a good contact with warm surface, matching solid wood anti-scald cup cover to prevent your hands from getting burned.BPA free sliding lid, eco-friendly and splash proof extra sealed and the lid cover provide maximum splash-proof.Perfect for home and durable enough to take camping year after year, it'll last a lifetime, it's easy to clean and unbreakable.