There may be color differences because of different devices. Please refer to the color of the product instead of the model. If there is any color and quality problem, we will give you the best solution. Nano bead hair extensions human hair is no heat, no glue, no chemical risk, virtually harmless to your hair and scalp. Nano bead is much smaller in size, which makes the final looking more seamless and natural and will not affect the normal growth of your own hair. Nano Hair:12inch-22inch,40g-50g per pack.For normal thickness hair,2-3 packs to adding length and slight thickness; for thinning hair, 3-4 packs are needed to add volume for a full head. Nano Ring Hair Extensions: Pre bonded fusion tipped hair with nano bead, each strand was well pre bonded individually, helping with the decrease of shedding hair. It is suggested to install by professional hairdresser for a beautiful outcome. RUNATURE Nano Hair Extensions Real Human Hair is make by remy human hair, healthy, soft, shine. Can be washed, straightened and curled like your own hair.