Make of plastic, insulation, light weight, not easy to break and deform, and ensures a long terms to use The electrical extender outlet shims are use to prevent or repair sink and loose outlets due to long term use, keeping outlets stable Stackable light switches spacers, can be stacked to form any thickness according to your needs Easy to separate and tear without tools required, fast and convenient The sockets plug washers are easy to install, just remove the loose outlet, then stack the spacers and insert it behind the screw, and fixed with screws