The things you place into the tumbler especially to polish the rocks in the final stage is normally made of cerium oxide, tin oxide, chrome oxide, or aluminum oxide. This is a sort of grit historically called a polishing compound and is extremely high-quality. Substantial hardness, significant modulus of elasticity https://www.facebook.com/permalink.php?story_fbid=pfbid0VCARyNTxLQN8hADkVfrhkW4wGZovySkKkrVrvNWaDKt4A6wDueGSLFr7dSah3zWDl&id=61560512640678&__cft__[0]=AZX1XKgfkza3ybh0dgXN7DIN3AQ1zHwKM2J5m0GuBCiUlnDa9UAYG5n-yrsmrB-WRPkyvTmpnErYcGlcQK89f27L0DrSRF3_XV7Eybw7oOHAmohQFFOxB32l79W6GsjjUjSD4m6vEHEkDy-rgpBasq-Rue_QQKaXnivpkwo-kb_YC1oCIdS0gSZ2yfJrmQezs7GsMc1TIFAZ2oGbW-IsnTOm&__tn__=%2CO%2CP-R