also: Resistive foam, ESD foam, black conductive polyurethane foam, dissipative foam
Comes with sensitive electronic chips and components. Available in various densities, soft or stiff. Good for pressure sensing.

Black conductive paper used for electrostatic field mapping.

>> http://store.pasco.com/pascostore/showdetl.cfm?&DID=9&Product_ID=1821&Detail=1

resistive fabrics are great for making pressure, bend and stretch sensors. There are a range of resistive fabrics available on the market for anti-static and electro magnetic field shielding purposes.

Conductive rubbers can be used for pressure, bend and stretch sensors. Because of their materiality they offer a nice haptic feedback, without the need for other squishy materials.