This is a complete 16-CD set of the "Life Education U-Can's Pimsleur Standard Chinese Course." The learning method involves listening to Chinese conversations on CD for 30 minutes a day, and there are no textbooks. (Some booklets may have been included at the time of purchase, but only the CDs are being sold.) The case for the CD containing lessons 17 and 18 is broken, but this does not affect the content of the CD. Thank you for looking.