What Tumbling Media is the Best?

What is the best media to clean and polish your brass? I test some commercial products and some suggestions from the internet.Video shot with Hero 3+ Black1

Rock Tumbling Media - Plastic Cone - 5/8 x 3/4 Size (1lbs): : Industrial & Scientific

تامبلت Thumler's Model B Rock Tumbler

Brass Tumbler made from a cement mixer

polish

Is it safe to tumble loaded ammo?

Wow

سنگ جاسپر خام

سنگ جاسپر خام

سنگ های قیمتی چگونه برش - کوارتز فکتینگ(تراش فست)