This is a set of 21 DVDs that came with Kodomo Challenge. The content is tailored to different ages, with videos covering songs, dances, numbers, and more. My child used to watch these when they were little. The set includes: - Puchi: Preparation Issue, April-March issues - Pocket: Hajimemashite (Welcome) - Pocket: April-March issues - Hopp: April-March issues - Step: April-June issues An extra (Kotoba Asobi DVD - Word Play DVD) is also included. I don't think there were any issues with playback, but I haven't re-checked. Please understand that I'm selling these at a low price. Thank you. - Number of CDs: 21 - Design: With colorful illustrations - Target age: For young children - Themes: Numbers and animals, songs, dances, letters, etc. Some DVDs have their original paper sleeves, while others do not. DVDs without sleeves will be shipped in a Kodomo Challenge pocket case. (See photos 2 and 3.)