Home Montessori Numbers (1-20) With Knob Numbers (1-20) With Knob Dimensions Size 10″ x 16″ Color Multi Material MDF Category: Montessori Related products Abacus (H) MontessoriRead more Abacus (F) MontessoriRead more Abacus (G) MontessoriRead more Abacus (C) MontessoriRead more