SMJ 1mm thick tungsten plates
From SMJ in Japan comes these two tungsten plates, both with a thickness of 1mm. The larger plate can be used to adjust the left and right weight balance by placing it under the receiver and ESC. It is especially suitable for stock class with large capacity batteries and small, lightweight ESCs. Since it is only 1mm thick, it barely affects the centre of gravity. The smaller plate can be placed anywhere on your car for adjusting the weight balance. The larger plate is 53x33x1mm and weighs 34grams, while the smaller plate is 33×16.7x1mm and weighs 11grams.
Source: SMJ [smj-rc.com]