This slim anti-wolf vacuum insulated cup is made of food-grade stainless steel on both inside and outside walls. Double walled insulation maintains hot or cold temperature of contents for a long time. It can also be used to withstand bad people in dangerous moments. The durable paint coating finish in gradient color means your mug is grip easily and fingerprint-free, also won't fade, peel or crack through extended use, so you can take this tumbler to anywhere. Custom logo is available.