Excellent Thermal Insulation Performance. Using High-quality Stainless Steel Metal Materials & Advanced Thermal Insulation Technology, the Thermal Insulation Effect is Excellent & the Drink Temperature Can be Maintained for a Long Time. Healthy & Eco Friendly. the Materials Are Safe & Harmless & Do Not Contain Harmful Substances, Ensuring Users Healthy Drink Water. Various Styles. Various Styles & Rich Colors to Meet the Personalized Needs of Different Users. The Dimensions of This Product Are 2.9*8.8 Inches, & the Size Can Also be Customized According to the Customers Needs.