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✨ Elevate your rock game with pro-grade polish power! ⚡
MJR Tumblers 400/600 Grit Aluminum Oxide Pre-Polish is a premium stage 3 rock tumbling grit designed for smooth, scratch-free stone surfaces. Compatible with rotary and vibratory tumblers, it delivers consistent abrasion for stones, minerals, and glass. Proudly made by a USA veteran-owned brand, it ensures reliable, professional-grade lapidary results.







| ASIN | B0CXSY5VXY |
| Best Sellers Rank | #19,888 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #39 in Tumbling Media |
| Brand | MJR Tumblers |
| Brand Name | MJR Tumblers |
| Compatible Material | Premium Quality Aluminum Oxide |
| Customer Reviews | 4.4 out of 5 stars 21 Reviews |
| Grit Material | Premium Quality Aluminum Oxide |
| Grit Material Type | Premium Quality Aluminum Oxide |
| Grit Number | 400 |
| Grit Type | 400/600 |
| Included Components | Instructions and Grit |
| Manufacturer | MJR Tumblers |
| Material | Premium Quality Aluminum Oxide |
| Material Type | Premium Quality Aluminum Oxide |
| Number of Items | 1 |
| Part Number | MJR1/2p400/600AO |
| Unit Count | 1 Count |
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