High Altitude Whiz Bang Rockets literally scream whistling to great heights and climax with a BANG as a single cap is detonated upon impact. The Sky Rocket Whiz Bang features multiple whistles combined with an integrated percussion cap detonation mechanism located behind the soft foam nose. Load a plastic cap inside and pull back into ready position. 3, 2 ,1 Launch! Each set includes two large rockets, launcher and 144 plastic Caps