Mail order company in roadrunner cartoons

You're thinking of the Acme brand!

In the Looney Tunes cartoons, particularly the Road Runner series, Acme is a fictional mail-order company that specializes in outlandish and often malfunctioning products. The company's name is often used as a punchline or a plot device to create comedic situations.

Acme products are typically depicted as being ridiculously over-the-top, such as giant rubber bands, rocket-powered skateboards, and exploding tennis balls. These products often backfire or malfunction, leading to humorous consequences for Wile E. Coyote, the hapless coyote who tries to catch the Road Runner.

The Acme brand has become an iconic part of Looney Tunes lore, symbolizing the absurdity and creativity of the cartoons.