Material: This jewelry rhinestone bracelet is made of high quality premium metal.Finely polished and anti-sweat erosion,smooth and comfortable. Eco-friendly, elegant and practica.Slim and elegant design let you to be the focus in any occasion. Easy to Use: The bling Fitbit charge 3/charge 4 metal band is easy adjust to fit your wrist size.No Tool Is Needed to resize this band,just open and remove the clasp adjust the size.(Method reference picture 5)