Official Demon Slayer S1 mug. Uses heat-sensitive coatings to create color-changing effect! This mug changes color depending on the drink's temperature! This mug is designed to capture the vibrant colors from Demon Slayer S1, making it a true delight for fans. To preserve this coffee mug, it is recommended to hand wash this mug. Whether it's a birthday, Christmas, or any special occasion, this mug is an absolute delight for anime enthusiasts. This mug holds 12 oz.