Travelers is an American insurance company.
Travelers uses direct mail letters to acquire new customers for its auto insurance offering. Travelers featured a customer testimonial to back up its savings promise.
Source: Comperemedia

See how the best marketers deliver results for their business with direct mail marketing
Over 10,000 businesses trust Lob to transform their direct mail into intelligent mail.

In this Best Direct Mail Campaign example, Chewy uses a self mailer as part of a new customer acquisition campaign, featuring imagery of furry friends.

Eyebobs uses direct mail self-mailers with an eye chart to test your eyes as a clever way to engage readers to purchase eyeglasses.

Sweater, the VC fund for everyone, uses direct mail postcards to drive investors to online reports and fund updates.