Sharing a feature in more than one controller

I have 3 controllers for different pages of product types.
In all this pages only the header area looks similar (images and text form a database, some price calculations). I don't want to create this area in all 3 controllers over and over again.
How can i share this feature in all 3 controllers? In the MY_Controller it is always loaded (not only on product pages) and i think this is not so good. Is there another solution or best practise?