All non-wire solids contain a property that identifies the desired material. You can change the material of a solid by displaying its property grid from the Browser and choosing a material from the Material option. You can choose one of the predefined materials or you can create a new material by choosing the at the top of the list. is the default material.
The Browser lists the number of solids associated with each material, next to the material name.
Note that once you change the material of a solid, that material is automatically chosen for all subsequent solids you create.