Lead

"This baby's military-grade stuff&mdash;the signal can get through most anything, short of a few metric tons of lead or an Imperial data center's jamming field."

- Gandr Spanjaf to Merei Spanjaf, giving her a locator device

Lead was a substance sometimes used in building. When Gandr Spanjaf gave his daughter, Jessa, a locator, he promised her that it would broadcast through just about anything, short of an Imperial jamming field or a few metric tons of lead.

Appearances

 * Servants of the Empire: Imperial Justice