18-8 Stainless Steel dual wall, Copper lined vacuum insulation Includes a leak proof screw on lid with a visual open/close push button locking closure. Made of FDA compliant materials. Vacuum insulation provides optimum heat retention at least 9X longer. Lid can come apart for easy cleaning. Patented designed lid Features lip and finger grooves that allow you to position the drinking spout without even looking. Complies with FDA. 2.75" D x 2.75" W x 9.25" H