HIGH-GRADE MATERIAL - Made Of Safe And Environmentally Friendly Ceramics, Perfect Size Holds 11 Ounces Of Your Favorite Beverage, Measured 3.1inch Diameter By 3.7inch Tall. And Ceramic Mug With Ergonomic Designed Heart Handle Which Is Easy To Hold. HOW TO ACTIVATE COLOR CHANGE - The Mug Is Black In Cold, In Order To Activate Funny Coffee Mugs The Temperature Of The Hot Liquid Should Be Over 70?/151?. At That Temperature It Is Possible For The Color Of The Coffee Mug To Change, It's A Very Creative Magic Ceramic Mug FUNNY MUG - The Double-sided Printed Ceramic Coffee Cup Has The Right Size And Thickness To Keep The Coffee Warm. Various Colors Increase The Sense Of Style And Make Your Morning Brighter. The Cup Will Provide You With The Perfect Coffee Time. MULTI-FUNCTIONS - It Can Be As A Gift Mug For Family, Friends, Coffee Lovers, A Great Gift For Birthday, Christmas, New Year And Other Holidays. Each Time He/she Use The Cup, He/she Will Think Of You. What A Cool, Novelty And Brilliant Gift ! And It Will Be Fun To Be Able To See How Full It Is From The Outside MULTIPURPOSE: This coffee mug is perfect for camping, picnics, tailgating and so much more. Whether you?re on the go, in the office, at school, or lounging on your couch this mug will keep you toasty on those chilly days. We aim to give you that same trendy coffee house feel when you visit your favorite cafe anywhere you go!