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✨ Elevate Your Stones to Museum-Quality Shine ⚙️
The MJR Tumblers Rock Tumbler Grit Kit Refill is a complete 4-step polishing system designed specifically for 18lb rock tumblers. Featuring silicon carbide grits for coarse to pre-polish stages and a premium 12,000 grit aluminum oxide polish for the final ultra-fine finish, it ensures professional-grade results. Compatible with rotary and vibratory tumblers, this USA veteran-owned brand offers pre-measured, easy-to-use refills that transform rough stones into brilliantly polished gems.







| ASIN | B07F75K1WR |
| Best Sellers Rank | #46,054 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #46 in Tumbling Media |
| Brand | MJR Tumblers |
| Brand Name | MJR Tumblers |
| Compatible Material | Aluminum Oxide, Silicon Carbide |
| Customer Reviews | 4.5 out of 5 stars 1,307 Reviews |
| Grit Material | Aluminum Oxide; Silicon Carbide |
| Grit Material Type | Aluminum Oxide; Silicon Carbide |
| Grit Number | 60 |
| Grit Type | Coarse; Fine; Pre Polish; Polish |
| Item Dimensions | 8 x 6 x 1.5 inches |
| Item dimensions L x W x H | 8 x 6 x 1.5 inches |
| Manufacturer | MJR Tumblers |
| Material | Aluminum Oxide, Plastic Pellets, Silicon Carbide |
| Material Type | Aluminum Oxide, Plastic Pellets, Silicon Carbide |
| Model | MJR18pgk |
| Number of Items | 4 |
| Number of Packs | 1 |
| Part Number | MJR18pgk |
| Set Name | Refill Grit Kit |
| Unit Count | 1 Count |
C**R
Good value for the quality
Top Notch. Switched from another brand and really love how it's making the rocks shine!!!
B**N
Great product deceptive practices
Absolutely wonderful product but where there is a positive there's also a negative. The way the bags are presentoo.Seem like you are getting a lot of product. Once hung in that bag , it comes to less than a half an inch of product on the bottom. Quit the deception quit wasting plastic and if you're gonna cell that smell of quantity. Please do not deceive the customers with the large bag.Cut it down your size
W**N
nice grit will buy again
feels good to support a veteran
C**M
3 pounds of media to tumble 15 pounds of rock, not exactly what I though I was buying.
Kind of annoyed that they don't have the nice labels as shown in the photos, would have made it easy to keep separated. Instead there's these small clear labels on the bags that you have to find.... That's basically half star off instead of a full star.... Fortunately, identifying the grits by sight looks like it should be fairly easy, especially the 12,000 grit AO polish powder - wish that was available on its own.... but I did find a diamond powder / polish mix alternative that might work at a similar cost per pound. Would have been real nice if the description was a little more clear in what you get.... i.e. 3lb media for 15lbs of rocks... which is the other half star off.... I was looking at a 7.2lb of media kit for about the same price only it had the 1500grit AO polishing powder.
S**A
Pleased
The size was standard size happy with purchase
J**Z
good product for polishing
good product, just what i needed
B**S
Bags are not full
Only used the 60/90 so far but I got very little grit in each package. This grit does not feel as strong/sharp as what came with my tumbler, coincidentally that is about how much you get in this order, enough for about one tumble like you get with your kit.
K**A
Passion-fueled and high quality
This grit and polish set is exceptional. You can tell it was crafted by people who genuinely care — not just about rocks, but about the process and purpose. This company emanates expertise and enthusiasm, and that shows in the results. My rocks came out more beautiful than ever and I would prefer to buy only from these rock guys. The picture is of some rocks from my apartment landscaping after the process . The instructions are detailed but easy to follow. It’s not your typical instruction manual, rather a sincere document created by the seller from the heart (their tips and tricks included!). It’s really unique and special. I’ve been using a “gimmicky” tumbler set for my HS STEM program and at home with my kids. As a teacher, is a great tool for many lessons and even many subjects.
K**E
Will buy again
I purchased a rock tumbler, the first time I uses it I used the grit it came with. I wasn't happy with results. So looked into different grit. I only used the shine grit ( last stage) on the rocks that had already been tumbled with a shine grit and I was surprised at the difference. I haven't used the others but I'm sure the quality is just as good.
S**O
arrived safe
fast delivery from the US to the UK arrived with NO leakage of grit. Was confused about the amount as said 50lbs was thinking that was the wieght of it, but after checking more I realised was for a 50lb tumbler size . So was spot on wieghing 9lb. 60z.
A**Y
Worked as advertised
I'm new to rock tumbling, I've used a few different polishing grits and this is the best one so far. I ran this polish cycle for 7 days and am happy with the results.
P**N
Si
As described, arrived early, Thank you.
A**R
Excellent produit
Commande arrivé en temps et en excellente condition.
Trustpilot
2 days ago
3 days ago