Opening diameter: 3.3cm Base diameter: 6.5cm . Capacity: 500ml. Weight 117gr. Stone finish. Native sport lid with flip-open straw. 18/8 food grade stainless steel. 100% BPA-free, phthalate-free, toxin-free. Does not retain nor impart any flavor. One twist to open, leak-proof lid. Wide mouth for ice filling and easy cleaning. Single wall (see Thermal Cover). Airport security friendly. Hand wash recommended