SUPOW&reg; Fastener Ring for Fitbit Alta, New Design Metal Keeper Ring Accessories for Fitbit Alta Bands Colorful Metal Security Wristbands Clasp Designed specially for fitbit Alta to protect the clasp loose and band fall off. All materials on human skin without injury, environmentally safe, do not worry cause allergy after you have worn. This simple insurance will keep your Fitbit safe. Light weight and more flexible. Easy to install - Just slide the fastener over the clasp when you put on your Fitbit Alta simple as that. Compatible For Fitbit Alta Wristband.