A unique, useful and fun promotional gift. Outer wall of mug appears black when cold then turns white when hot beverage is added , revealing logo • AB grade ceramic: 9.6 ( h ) • 0.325LnnCeramic care instructions:n· Do not scratch printn· Avoid using strong detergents to cleann· Hand wash onlyn· Do not use scourer or abrasive cloth to washn· Do not soak in hot water for prolonged periods