These six letters are pronouncing from the throat. (Alif with harakah(zer, Zabar pesh) also called as hamza). The throat has three sections, bottom, middle, and top. These letters with examples are below:
If zabar (fatha) comes before an alif or zer (kasra) before a yaa or a pesh (dhamma) before a wow, then the sound will lengthen for 1 second. (1 second is just for the guide. Practice from your teacher for accurate sound). Also an important Tajweed Rules. Examples of words with huroof e Madda are below:
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