Come and Check Our Promo Solutions.304 stainless steel one-piece seamless liner. Double-layer thermos cup, heat preservation and cold preservation. The non-slip silicone at the bottom prevents the water cup from slipping. The push-on cup lid is convenient for sip drinking. The large diameter is easy to clean, and there is a silicone pad on the lid to provide better sealing. Have 510 mL and 380 mL for option. Pls check inventory and detailed info with us before placing your orders.