Product Description: High quality double layer stainless steel inner liner vacuum design insulation effect: Above 50 ℃ (6 hours), above 40 ℃ (12 hours) Inner liner surface adopts electrolytic grinding technology to prevent dirt from forming sealing rings, and food grade PP grade materials are used along the mouth, ensuring health and worry free cup lids and stoppers have good sealing performance without dripping or leakage