We have 0.5kg, 1kg, 2kg, 2.5kg, 3kg, 4kg, 5kg, 5.5kg, 6kg, 8kg, 12kg, 16kg etc for your option. International size: 1kg, 2kg, 3kg, USA Kerr 1kg, 3kg etc melting crucibles. What's more we can make tailored products based on your size and samples, high purity, durable.