These discs are made to pair with strong magnets in our projects, so it does help reducing errors, making the project easy to make, and also being less expensive then using all magnets. Pack with 12. They are round - 3/4" diameter
These are NOT magnets, and will not stick together, they are available for purchase to work alongside your magnets.
Boxes and other cartonnage projects work great when adding strong magnets and these steel discs. They are tested and approved by Claudia!