Harry Potter I Solemnly Swear... Color Changing Mug, 11oz.

The "Harry Potter I Solemnly Swear... Color Changing Mug" is a magical addition to any Harry Potter fan's collection. This ceramic coffee mug features a color-changing design that reveals a special message when hot liquid is poured into it. With a capacity of 11oz, this mug is perfect for enjoying your favorite hot beverages while showcasing your love for the wizarding world. The iconic phrase "I Solemnly Swear That I Am Up To No Good" adds a touch of charm and mystery to your daily coffee routine.