4 mailer

You're referring to a "4-mailer"!

A 4-mailer is a type of direct mail piece that consists of four separate pieces of mail, usually sent to a single recipient. Each piece is designed to be opened and read separately, and they often work together to convey a single message or promote a specific product or service.

Here's a common example of a 4-mailer:

1. A letter or brochure that introduces the product or service and provides an overview of its benefits.
2. A flyer or insert that highlights a specific feature or promotion.
3. A reply card or order form that allows the recipient to respond or place an order.
4. A separate piece, such as a brochure or catalog, that provides more detailed information about the product or service.

The idea behind a 4-mailer is to create a sense of anticipation and excitement by sending multiple pieces of mail that build on each other. This can be an effective way to grab the recipient's attention and encourage them to take action.