Thank you Melissa and Doug for saving us from those plastic magnetic refrigerator letters. These wooden magnetic letters are great. The entire back of each letter is covered in one solid magnet, unlike the little chokeable pieces of magnets that always fall out of the plastic kind. Melissa and Doug’s wooden letters consist of 52 letters, including both upper and lower case letters. In my experience as an early childhood educator, it is best to introduce young children to upper case and lower case letters at the same time. When they are learned separately, I have observed more confusion from the children. This product has been rated for children ages 3-8 years old, however I have used them in my home with children as young as one year old. The magnet is securely fixed the back, however I would make sure that young children do not put the letters in their mouth. The paint can come off, and it is probably not wise to chew on magnets. Thank you Melissa and Doug for another great natural toy!