Capacity: 0.5L; Heat retention after 6h >= 78 C; Body: Double-walled 304 & 201 stainless steel for heat preservation, coated with a layer of silicone rubber for a more secure grip and resistance to wear (optional), customized patterns and colors; Outer lid: 304 stainless steel material, just twist to open, can be used as a cup; Inner lid: Polypropylene material, just press the button to open and get water, then twist to fully open; Color and Pattern: Optional or customized; Logo: Rang Dong; OEM: Accepted;