The light green obi is not included (removed during photography). The following is written on the obi: A Guide to Building Analog Synths "How do you build it?" "How do you use it?" "Why does it work?" This book explains the main modules and system mechanisms of analog synthesizers, covering the three themes above, and teaches you how to build an analog synth from scratch in an easy-to-understand way. All you need are inexpensive parts and curiosity!! Price: 2680 yen + tax A detailed guidebook on building your own analog synthesizer. Table of Contents: Rich in content, covering everything from the basics to advanced applications of analog synthesizers. Thank you for looking.