Roller Banner.

Roller banner.

(There were no spelling, grammar, or punctuation errors in the original text, so I did not change those elements.)

However, to make the text clearer, it could be expanded upon:

A roller banner is a portable display used for advertising, marketing, or promotional purposes. It consists of a printed graphic panel attached to a retractable mechanism that can be easily rolled up and down. Roller banners are commonly used at trade shows, conferences, exhibitions, and other events where businesses and organizations want to showcase their brand, products, or services.