VIC-20 requires 65 buttons. 70 are included to give you some extra in case any are damaged in shipping or installation.
Keyboard circuit board is not included
Peel and stick
Clean circuit board contacts with 90% isopropyl alcohol
Peel brown paper off button repair and place down gently and flat
ButtonWorx™ membrane repair pad sticks to the circuit board. Membrane is 0.45mm thick and has a spacer gap to keep conductive material hovering just above the contacts. The original buttons press down on the the ButtonWorx™ repair pads and that completes the circuit.