Gmail sponsored promotion GSP is a unique ad type that shows up only in personal Gmail boxes (it does not show in Google business apps email boxes) in the promotions tab. The ad is comprised of 2 creative elements: a teaser ad and an expanded ad unit. The teaser has a 25 character text headline and 100 characters of body text. There is also a 50×50 image in the ad and the “Company Name” you declare.