S10, our most popular birdie is the slowest flying of all the Jazzminton Sport birdies. Our patent-pending birdies feature a Dynamic Brake technology, designed for optimal flight precision and gameplay. Thanks to Dynamic Brake, the birdies slow down as they fly, creating smooth, controlled rallies and exciting, competitive gameplay. The harder they're hit, the faster they slow down, keeping every shot in play for nonstop fun!