5 Pounds of #61 Rapid Polish (a sub micron aluminum oxide polish). This package has 5x as much grit and polish as being the standard kit for about three.3x the cost. More Information. Warning: Tend not to get rid of used grit, polish or rock slurry down a drain. Furthermore, https://siliconcarbideprotectingt25803.plpwiki.com/6179417/the_ultimate_guide_to_silicon_carbide_bipolar_transistor