MINI gokaku MASU strapA small Masu box that only holds 1 ml of fluid, this charm is withoutdoubt the smallest Masu in the world. Handmade using the same skills applied to traditional Masu making, the size of this charm may be small, but the craftsmanship put into making this Mini Masu isn't. In Japan, the Masu box is considered a token of good luck and prosperity. Carry it around every day as a lucky charm.