FR-4. hot bed size: 214mm * 214mm * 1.6mm hot beds heated area size: 200 * 200mm. color: red power supply: 12V or 24V. Resistance: 1.0~1.2 ohm (12V) - 3-3.4 ohm(24V) power is about 120W.
Printing
Previously the accepted method was to cover the PCB heatbed with kapton tape, degrease it and print. An alternative method that has become popular is to use a sheet of 3mm borosilicate glass, held using bulldog clips (see the Discussion tab). Adherence of the printed object to the glass is helped by spraying the clean glass with hair lacquer (the "extra strength" type).
ABS temperature range: 100-110°C
PLA temperature range: 50-70°C
These ranges of temperatures are indicative only, you'll have to test and see what works best for your printer/filament/hotend setup.
MAKE SURE YOUR Power Supply HAS 10 MORE AMPS SPARE!!!