It is a food-grade material that does not release harmful substances when in contact with drinking water and enables the cup to have a good thermal insulation performance. The seal is made of silicone, which is of high quality and healthy, durable and odorless, and does not leak when inverted. Under normal use, the lid can be tightened without leaking and can be carried in and out of the bag without worry. The newly introduced – einforced barrier paint- forms a protective film on the original stainless steel surface, extending the life of the cup.Great for promotional giveaways, each cup can be customized with your logo or name for maximum brand awareness! Measuring 12oz/17oz, this custom double layer car tumbler with carrying strap. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. Tailored branding: Supports logo imprint and design personalization. Product Highlights: BPA-free, leak-proof, travel-friendly.