Ok, I know this is going to get asked, so here's the deal.
1. The rotor contacts are thermally bonded so there is no rivet that will internally short to the shaft or come loose.
2. This particular red resin has a thermal expansion rate that's about 1/10th of the typical black plastic rotor. That means they fit tight to the shaft even when hot, and the expansion won't make the rivet fall out (again, no rivet!).
3. The fit to the shaft is literally perfect. Any tighter and it would be a problem fitting them and any looser it would be like the made in Italy version which can rotate slightly on the shaft.
4. There's no carbon content in the red plastic as there is in black. That means these rotors will be far less likely to lend themselves to a misfire. The composition has zero components that convey electricity, with the exception of the obvious solid brass contact.
5. The contact has an exaggerated rounded trailing edge which can help eliminate misfires caused by phasing issues, fairly common in the TR6 distributor.
I don't mean this to be a sales pitch, just the improvements made over the "readily available" stuff. If you're tired of rotors failing, here's the solution (many, many months in the making.)