Encased in 100% Quartz is a 6mm cylinder of real lab created ruby. Ruby changes color with heat so these have the same function as the cadmium core bangers without the risk of inhaling dangerous chemicals. Ruby itself is a safe surface so this was a no brainer to get rid of cadmium and replace it with a much safer material. Since ruby is superior to quartz as a heat surface, it will also slightly increase the heat retention of the banger.
2mm thick wall
Encased ruby cylinder
We were the first to do the ruby banger, if anyone cares