The bands fit well with Fitbit Ace 2018 / Fitbit Alta HR 2017 / Fitbit Alta 2016 Fitness Tracker. Note: No Fitbit device included High Quality Material: this bands for Fitbit Alta (HR) / Ace is made up of soft, flexible and durable material. 100% friendly to your skin. Two size available: wristbands for Fitbit Alta HR bands available in two size: small size fits 5.5 - 6.7 inch wrists. Large size fits for 6.7 - 8.1 inch wrists. Classic Buckle Design: Fine craft design buckle: with a same color wi