This is a type of chocolate.
From the manufacturer:
Welcome to the world of "Meiji The Chocolate," the world in which taste sensations are born from "Bean to Bar" -- a process by which cocoa beans are carefully selected in order to create the perfect bar of chocolate. Each bar reflects an elegant luster, emits a sweet fragrance, and melts heavenly in your mouth.
This Velvet Milk flavor mainly uses cocoa beans from Venezuela. A high-temperature deep roast creates its harmony of deep aroma and thick milky flavor: the next level of chocolatey goodness.
Contains 49% cacao.