Montessori Rainbow Rings Dominos Children Preschool Teaching Aids Counting and Stacking Board Wooden Math Toy This allows your baby to add, Subtract, multiply and divide. Let your baby learn basic computing method. Age Range: Suit for children over 3 years Color: As shown in pictures Material: Wood and plastic Size: about 44 x 14 x 1.5cm/17.32 x 5.51 x 0.59 inch