Come and see our amazing products. 304 stainless steel seamless connection to the inner wall, no matter what kind of drink you use, the inner tank will not rust. Comes with a mixing ball, which is very convenient for mixing protein.This vacuum insulated travel tumbler is crafted from 304 food-grade stainless steel, durable, and shatterproof. Highly resistant to rust and to absorbing odor, taste or bacteria. All components are non-toxic, BPA free and environmentally friendly, won't alter flavors or leach chemicals. Safer and healthier than a plastic water bottle. The large-capacity Tumbler don't require you frequent replenishment of water .This shaker tank fits all standard size cup holders.The travel mug is suitable to take to the gym, office,school,yoga, biking, road trips, hiking, sports games, body building,everywhere. Pls confirm further with us if any query about packing info, inventory status and time schedule.