This postage-stamp–sized tungsten block squeezes 11 g of ballast into just 20 × 10 mm and a mere 3 mm height. Thanks to tungsten’s density of ≈ 19.3 g cm⁻³ - more than double that of brass and lead - the weight occupies roughly half the volume a brass plate would need, so you can meet minimum weight rules and fine-tune chassis balance without giving up precious real estate in a crowded 1/10-scale layout. Slip it under or next to the receiver, servo or ESC and lower the centre of gravity for calmer weight transfer and more predictable corner-to-corner behaviour.
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