paper band; wrapper band; obi strip
A narrow paper band wrapped around a book, box, or product, often printed with promotional text or pricing. Commonly seen on Japanese books.
New books often have a paper band wrapped around them.
帯紙に書かれたキャッチコピーが目を引く。
The catchphrase printed on the wrapper band catches the eye.
Compound of 帯 (obi, 'belt, band') and 紙 (kami, 'paper'), referring to a paper band. The exact historical derivation is uncertain, but the word is straightforwardly descriptive.