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An obi (帯?) is a strip of paper looped around a book or other product. This extends the term obi used for Japanese clothing; it is written with the same kanji. It is also referred to as a tasuki (襷?) (another kimono accessory), or more narrowly as obigami (帯紙?, belt paper).
Many books in Japan are supplied with an obi, which is normally added outside any dust jacket. However, a book in a slipcase may have an obi around the slipcase.
In English, the term belly-band is sometimes used instead.
The term is also used for a strip that is looped over one side (usually on the left) or folded over the top of LP albums released in Japan, and folded over the left side of music CDs, video games, Laserdiscs, or DVDs. This is also called tasuki. Obi are unique to Japan and are used to provide the title of the product, track listings (if applicable), price, catalog number and information on related releases in Japanese. It is used by the consumer to determine what is included in the album or book, and the store can use the information for ordering. Obi are sometimes used on boxes for collectible toys and figures. Products with an obi have become popular with some collectors, as products with the obi intact can fetch premium prices, and are collectible items in their own right. A used/second hand record or CD with an still intact obi may be worth more than the same with the obi missing.