The instance type, such as t2.micro. For a list of supported instance types, open the stack in the console, choose Instances, and choose + Instance. The Size list contains the currently supported types. For more information, see Instance Families and Types (http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-types.html). The parameter values that you use to specify the various types are in the API Name column of the Available Instance Types table.