Doesn't really say what is in his Prime-all kit there. I am assuming, it is broken down to something that is not considered dangerous goods to ship;
https://sharpshooter-22lr-reloader.myshopify.com/
Love this article on it, he has some "alternatives" for the priming compound.
https://www.ammoland.com/2015/11/reloading-22lr-ammo/