Jewelry Casting Flask & Rubber Sprue Base Kiln Tool Kit 2 Pcs

I purchased two of these to cast rings. They serve this purpose well - I would say you could probably fit a total of three rings inside, if you have even modest skill in spruing. The small size means efficient use of investment, quick drying time (~2h) and quick firing (~8h including ramp times). It has a volume of about 100ml, which means you'll be using about 65g of water and 137g of investment per casting for a ring.I've done about ten firings with these without any trouble at all.