Alfin is a Rain-attribute Box Weapon with its whole body clad in Rain Flames. Its design is unique even among the Box Weapons left by Lorenzini and is considered a prototype Box Weapon furnished with an advanced communication system. Basil acquired it along with his Ring and the Book of Sukedachi in Spain after being sent ten years in the Future. The box itself has a metallic green look to it and has a black strip running along the side. The Box also has CEDEF engraved on the side, representing the Vongola External Advisory organization that Basil belongs to.