The Onn Pink Replacement Band is designed for Fitbit Flex models, offering an adjustable and soft rubber band suitable for wrists from 5.5" to 8.25". It features a metal buckle for secure fastening during activities such as gym workouts, weight lifting, yoga, and running. The water-resistant band is a single item set, providing a comfortable and durable option for those seeking a stylish and functional replacement band for their Fitbit Flex.