This thermos is made of 304 stainless steel. The PP lid has a silicone sealing ring inside to prevent water leakage. It can be left open for direct drinking. The size is 6"*3", the weight is 0.9 pounds, and the capacity is 17OZ. The double-layer vacuum design can keep warm and retain freshness. This product can be used at home, in the office, in the dormitory and other places or when going out. It has an exquisite appearance and is very suitable as a gift for relatives and friends. Prices for quantities over5000pc are based on sea freight.