From Brown Dog Gadgets in Milwaukee:

Create fun STEM and STEAM electronics projects with parts delivered to your door.

Crazy Circuits is a non-soldering electronic learning platform that allows people to create circuits from almost any material they can imagine. Crazy Circuits are designed to pop onto LEGO™ bricks, enabling your LEGO™ creations to shine, move, and make noise. Use Crazy Circuits to construct paper crafts with conductive tape, use conductive thread for sewing, and create art with conductive inks and paints. You can even program sketches with Arduino compatible Crazy Circuits boards. No matter what you want to build, Crazy Circuits brings it all together.