Come and Check Our Branding Solutions.18/8 Stainless Steel and BPA Free Plastic.keeps beverages cold up to 24 hours and hot up to 12 hours.Made with 18/8 pro-grade stainless steel to ensure durability,pure taste and no flavor transfer.Flex Cap is leakproof when closed,to transport without worry.Flex Strap is easy to transport and comfortable to carry. Pls check inventory and detailed info before placing your orders.