Treeyear Montessori Object Permanence Box Coin Box Preschool Learning Material for 6-12 Month Infant 1 Year Babies Toddlers Treeyear Montessori Object Permanence Box Coin Box Preschool Learning Material for 6-12 Month Infant 1 Year Babies Toddlers. Sale price : $15.99 Category : Toys & Hobbies