Spicy girls prefer the villain! Stainless steel with double wall vacuum insulation keeps drinks hot for 6+ hours and cold for 12+ hours- perfect for those marathon reading days all year round! Note: The book titles currently printed on the book images are random letters and not actual titles. However, we can customize your design by laser engraving your favorite titles or characters' names, or even your own name. Designer chooses placement based on where it looks best stylistically. If you choose to customize, please add your customization details below.