Double-wall vacuum insulation: keeping your hot drinks warm for up to 12 hours and your cold drinks chilled for up to 24 hours The exterior is crafted from 304 recycled stainless steel with a matte finish, Interior is also made of 304 recycled stainless steel for optimal temperature retention Bamboo lid with a handle with a gunmetal finish Size: 8.66"h x 2.95"diameter