Available sizes S-M (5.5-6.5) and M-L (6.5-9) inches (circumference of your wrist). The band is made from real leather and high-quality stainless steel. You can see the indicator lamps of the chip all the time during wearing. No need to get the chip out of the bracelet. NO NICKEL is used! How it Works: We engineered a fashionable way to securely hide your flex fitness tracker perfectly within a beautiful bracelet! So rather than wearing the rubber band that comes with your chip, simply use this elegant bracelet to dress up your look! No one will have any idea you are wearing a fitness tracker! Never lose your Activity Tracker again – Super secure. – Don’t ruin your professional or dressy outfit with a plastic wristband – Beautiful & high quality, it can be worn with or without your tracker. – I create stunning and unique pieces that are designed to take you from day to night! NOTE: DEVICE NOT INCLUDED.