How do I change the text size and component width of a UIPickerView?

I have the following code to create a UIPickerView:

pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0.0f, 416.0f - height, 320.0f, height)];
pickerView.delegate = self;
pickerView.showsSelectionIndicator = YES;
[pickerView setSoundsEnabled:YES];

I would like to change the component widths and change the text size in each component. Is it possible to do this?

Thanks!