We only use SHE by So. Cap. Extensions. They are 100% Human hair, with a keratin tipped bond. We use the Cold Fusion Machine, which uses electronic impulse waves to melt the keratin as opposed to high heat. This machine keeps the hair from being damaged by heat. It also creates a smaller flatter bond which makes the extensions more comfortable and as realistic as possible! There are 80+ colors which means thousands of color combinations to create the perfect match to your hair! Extensions are not just for length but also for color and thickness!