 We present a novel silicon-based pneumatactor array controlled by a sequence of high-frequency air walls engineered to deliver vibrotactile feedback. A PWM signal controls the direction of airflow within the walls, alternating their opening and closing to inflate and deflate the pneumatactor. At high frequencies, the pneumatactor diaphragms oscillate rapidly, up to 90 Hz. An array of pneumatactors can create interesting haptic patterns suitable for a range of applications in prosthetics, VR, and beyond.