These diamond cups allow the machine to run untended during each grit stage, as the abrasive is actually incorporated into the cups! Changing out the cups when you are ready for the next stage takes 10-20 seconds. No more babysitting, and no more mess!

Use 150 cups for the first grind, 300 cups for the second, 800 cups for pre-polish, and then use the wooden cups with polishing compound to polish (Compound is not provided, but is easily obtained - we tell you where).

Cups are offered in three sizes; small (polishes ½-¾" marbles), medium (for ¾-1&1/8" marbles) and large (for 1&1/8-2" marbles). We can actually size these cups as you wish, so if you are looking for something other than these standard sizes, please use the "Ask a question about this product" button above to tell us and we will let you know what we can do.

The coarsest cups wear down fastest. It varies, but it can wear down after as few as 6 or 7 dozen marbles. The 800 grit will last much longer, and the wooden polish cups only get better with use, and last forever. You can contact the manufacturer if more cups are desired (contact details will be included).