Rustbug hoop

The Rustbug Hoop is the latest piece of Decepticon weapons technology for handling extremely small flying opponents. It is just a coincidence that it looks like an electrically charged fly swatter. Oh yes.

Fiction

The Rustbug Hoop was only seen in the Marvel UK Earthforce story Bugged!.

Starscream was on monitoring duty at Shockwave's base when he spotted a visitation by the Insecticons, spying for Megatron as part of the Decepticon Civil War. After a quick trip to the armoury, Starscream was ready. The Insecticons attacked him so he pulled out the Rustbug Hoop and casually swatted them all. Bugged!

From Teletraan I: The Transformers Wiki, a Wikia wiki.