From Teletraan I: The Transformers Wiki

The Chaosmaster Bomb is a weapon in the Generation 2 portion of the Generation 1 continuity family.

Gigantic, spherical, and nice n' shiny, the Chaosmaster bomb was adorned with a symbol that humans commonly use on radioactive materials.

Whether the Chaosmaster Bomb was specially made, or a standard product available at better discount stores everywhere, is not clear. It certainly has a catchy name.

[edit] Fiction

[edit] Marvel Comics continuity

[edit] Generation 2

Grimlock's plan to destroy Jhiaxus' flagship, the Twilight, involved the Chaosmaster Bomb. Grimlock was sufficiently impressed by its power to make a non-characteristic remark about its safety factor, but in the end the bomb never went off. Devices and Desires!