The abrasive I find hardest to locate online is the unitized wheel, it looks like this.
It goes on the CPM-12 mandrel shown below.
It fast to change and does not create as much mess as the cartridge roll. I can buy them locally, but they have to order them. They charge me more than the catalog price. I was just hoping to find everything at one location where I could buy smaller quantities, I'm not looking to spend $150 for the smallest quantity.
But oh well that's life!