Be sure to add me to your favorites list Original Casio CTK-411 (can also be used with the CTK-431) Electronic Keyboard Original Owner's Manual Book. This is an original full User's / Operation Manual for the Casio CTK411 electronic keyboard. This manual is in good to very good condition and has great information in both English and Spanish. There is some creasing, makrs and finger indentations on the covers, but less wear on the pages and no writing. This manual can also be used with the CTK-431 model as well, as it is similar. This is a very helpful owner's guide if you have one of these great Casio keyboards, thank you for looking! This is a manual or document, this is NOT a piece of equipment or instrument. If you have any questions, I'm always happy to answer them. Check out my Store!