HeyCurls clip-in extensions come in a set of 7 pieces of 120 gram. If you are just looking to add volume and using the HeyCurls clip-in hair extensions in between your own hair, 1 set is enough. If you are planning to braid your hair away and use our HeyCurls clip-in hair extensions as a protective style, or if you want to add considerable length, we recommend 2 sets.