24 and extends from the sheet 22 to an appropriate electrical source located within the data terminal not shown it is obvious that other electrical conductors 26 such as flexible strips of conducting material may also be used in place of the coating 26 positioned adjacent the sheet 22 is a spacer sheet 28 preferably composed of an insulator material such as mylar having a plurality of apertures 30 each in registration with one of the bubble portions 24 as shown more clearly in fig2 the apertures 30 have a diameter preferably equal to or larger than the diameter of the bubble portions 24 located adjacent and below the spacer sheet 28 is a flexible support sheet 32 having a plurality of bubble portions 34 each located in registration with one of said apertures 30 in sheet 28 and an associated bubble portion 24 in sheet 22 the support sheet 32 is preferably composed of the same flexible insulating material as that of sheet 22 and has secured to the top surface of each of the bubble portions 24 an individual electrical conductor 36 which as shown in fig1 extends through a neck portion 38 of the sheet 32 for connection to the terminal in which the keyboard 20 is located in a manner that is well known in the art the conductor 36 may be composed of the same material as that of electrical conductor coating 26 the bubble portions 24 and 34 are preferably formed with the same radius of curvature in order for the electrical conductors 26 and 36.