GongYi #4 (9.9lbs-4.5kg) Clay Graphite Crucible for Metal Melting Casting Refining Gold Silver Copper Brass Aluminum

I bought the #4 and #6 crucibles. They arrived packaged very well in fitted foam inside cardboard boxes. They seem sturdy with thick walls. I am happy with the apparent quality and condition. I haven't fired them up yet but they came with instructions for seasoning them first. The widths and heights for both are about 1/8" smaller than the description, but that's close enough. As far as fitting tongs to them, the #6 has nearly straight vertical walls but narrows at the bottom, while the #4 noticeably tapers gradually a bit all the way to the bottom. My disappointment was that they hold smaller capacity than what was described. I filled them each to the brim with sand and then measured it. The #4 described as 490 ml holds only 400 ml of sand, while the #6 described as 710 ml holds only 575 ml. That means that the actual capacity of them is 20% less than the product descriptions show. On top of that, I had planned on filling them to 80% for safety but that means they will only safely hold maybe 60% of their described capacities. It makes me wonder if all sizes are that way. Maybe crucibles of any brand are measured this way and I'm just understanding it wrong, but now I know that I'll have to buy several sizes larger than I originally planned for my melt capacities. Other than that, I'm happy with them and plan to buy another larger one.

Excellent units. Best on market. we have 22 others and these last considerable longer than others

I melted alot cans in it an it still looks good

The media could not be loaded.  Boyfriend bought 2 of these. He got the 5s and the 4. He uses them for melting down his cans. He melts down cans for hours at a time and these have held up for him. He will put them in the oven and preheat it to 200+ degrees before putting it in the foundry, to avoid the crucible possibly breaking. Happy with the purchase