5 pounds of #sixty one Rapid Polish (a sub micron aluminum oxide polish). This kit has 5x as much grit and polish as the standard kit for about 3.3x the cost. More Information. Caution: Tend not to eliminate used grit, polish or rock slurry down a drain. Materiales refractarios: SiC https://silicon-carbide-nozzle15814.mybuzzblog.com/8486104/top-silicon-carbide-crucible-msds-secrets