5cm diameter x 3mm. 20g. For use on tablets and laptop computers. Best used close to the battery. Painted with an original design (partial coverage does not interfere with the effectiveness of the shungite). Make your electronic devices beautiful and safe! For smart phones, we recommend using the non-painted disc as the coating will come off over time by the heat of your hand when regularly holding it. Note: Although it comes with tape on the back, it is very strong. In order to be able to remove the plaque in the future, we recommend using your own double-sided tape when attaching it to the back of the phone. Can also be slipped into the pocket of a cell phone case. Neutralizes about 98% of the harmful aspects of EMFs, so your device is safe to use. Does not lower the EMFs necessary for functioning, so your devices work normally.