the description :

Leakproof Water Bottle, Double Wall Sports Travel Mug, Keep Cold
The exterior is made of high quality  plastic. It also has a silicone base designed to prevent it from slipping and spilling.
Features double walled, premium plated brass on the outside of the inner wall. , keeps liquid cold up to 10 hours.
The stainless steel flask is designed to reduce spills and slippage. The bottle is leak-proof and secure in the bag when on the go. 17oz/500ml water bottle fits in most cup holders and fits easily into a travel bag.
The inside of the lid is integrated with a leak-proof polypropylene silicone ring. Simple structure, washable with the spout removed, the cup spout is smooth, will not cut the lips, the cup has a large diameter, has a detachable filter mesh, can filter residues such as tea. The bottom of the cup is made of non-slip material, which is not easy to slide and is durable.