Promotional Optimus - 590 ml Double Wall Stainless Tumbler with Ceramic Interior Elevate your daily hydration with the Optimus - 590 ml Double Wall Stainless Tumbler with Ceramic Interior. Crafted from recycled 304 stainless steel, this tumbler features advanced double wall vacuum insulation, keeping your drinks hot for up to 6 hours and cold for up to 12 hours. The interior is lined with a ceramic coating, ensuring a pure taste experience, free from any metallic aftertaste. The Optimus tumbler is not only functional but also stylish, with a matte coating on the body and a sleek metal silver finish on the upper part. The clear AS lid presses on securely, preventing spills and making it easy to sip on the go. Designed for everyday use, whether at home, in the office, or on the move, this tumbler is the perfect companion for all your beverage needs. Please note, it is not suitable for dishwashers or microwaves.