This listing is for 1 stretch bracelet(approximately 8.5") It  is made with Shungite, Selenite and Copper which protects against EMF(Electromagnetic Fields), Cleanses Crystals and Protects. Copper acts as an amplifer. 
Shungite protects you from harmful EMF. I've been wearing Shungite when I go to bed and I've had some amazing restful sleep. I feel very protected when I wear Shungite hence why I promote this amazing stone and its natural qualities.
Copper does oxidate and change colors.