The two-way action provides air on both the push and pull stroke of the pump. This makes balloons inflate faster giving you more time to be creative and have fun while taking away the frustration of pumping. The nozzle is built for 260Q balloons but also works great for 160Q's, 350Q's, bee bodies, geo blossoms and donuts, regular round balloons, rocket balloons, and a host of other balloons.