In 2022. According to the cyclist's website, the k3plus vest version of Dalian Airlines is an upgraded version of K3, which was launched in the spring of 2022. The k3plus vest version of Dahang is comfortable and stable to ride and adapt to all kinds of road conditions. It's a folding bicycle, aluminum alloy inner wire frame, 16 inch wheel hub, 9-speed gear shift and so on. Positioning as a small steel gun in the city, taking into account the folding space and riding speed, it is the best choice for commuting.