CD set from the Ikuwel Listening series. It is said that listening to it every day will make children smarter. Education up to the age of 3 is the most important (according to Ikuwel). Some CDs have minor scratches, but there are no problems with listening. - Used from 1 to 2 years old. These are sold individually, so how about trying them out for your child? - Format: CD Thank you for looking.