Over N Over Transportation Reusable Glass Etching Stencil. Works best with Armour Etching Creme.

Each stencil can be reused between 15 to 20 times depending on the amount of pressure, care of use, distance between the tip of the blasting gun and the stencil, and the type of abrasive (between 180-220 grit size preferably 220 recommended).

Sizes are approximate width x height 
Helicopter ..2.5 x 1.0" 
Spaceship..1.0 x 1.75" 
Train... 2.5 x 1.0" 
Airplane.. 2.5 x 1.5" 
Truck..2.5 x 1.5"