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The Yeti Rambler 20oz Tumbler in BlackYeti’s Rambler® 20oz Tumbler is made from durable stainless steel with double-wall vacuum insulation to protect your hot or cold beverage. The magnet on the included MagSlider™ Lid adds an additional barrier of protection for keeping drinks contained and preventing heat or cold from escaping.Please note - this magnet component is not leakproof and will not prevent spills.