These Montessori alphabet coins are a great addition to your collection of alphabet learning materials. Each coin is 1.5 inches in diameter and created in a Montessori style font. The consinents are red and vowels are blue just as seen in traditional Montessori sandpaper letters and movable alphabets. Each set comes with the full alphabet with your choice of upper case, lower case or both. Please note, the coins could pose a choking hazard for children under 3.