Ever since she first became The Wasp, Janet van Dyne only had her tiny size to get herself out of tight situations. Contemplating this, her partner Henry Pym invented a miniature air gun for her to use as a non-lethal weapon. Spider-Man was the first victim of The Wasp's Sting in the story "On the trail of the Amazing Spider-Man"
The Wasp's Sting first appeared in Tales To Astonish #57 (Jul. 1964). It was conceptualised and drawn by Stan Lee and Dick Ayers.
The Wasp's Sting is a miniature air gun that straps on to the forearm. The trigger is a ring attached to the gun via an elasticated cord. In order to shoot the "stings" the ring finger needs to be bent inwards. The Wasp's sting fires non-lethal cartridges of compressed air. It can fire one continuous burst or short sudden ones, depending on how long the finger is held down.