Star Wars : The Last Jedi Episode 8 - Rey Heat Reveal Coffee Mug - Lightsaber Activates w/ Heat.  Just add a hot beverage to the mug and watch as a lightsaber appears in Rey's hand and her name by her side surrounded by stars. This ceramic mug is great for Star Wars fans, especially those fond of the talented Rey of Jakku. Heat reveal works with coffee, hot chocolate, or any warm beverage. Hand wash only. Not microwave safe. Measures: 4" x 6" x 4.25"