Write the next sentence in this paragraph:

How to cast metal
Get a 2-piece mold frame.
To successfully cast metal, you'll first need to acquire a mold frame (also known as a mold flask) made of wood, iron, or a similarly solid material. Make sure the frame comes in 2 parts and is large enough to hold the object you want to cast.
Look for mold frames online or from specialty metal supply stores. As long as it is sturdy, the specific material used to make your mold frame does not matter.