Plastic. 1 x 600mA Ni-MN battery and 1 x white patented LED. LED bulb. Energy efficient. 10,000 - 12,000 MCD lumen output. Life of bulb 6,000hrs. Spike fitting. Height with spike 40.5cm. Height above ground 30.5cm. Diameter 11.5cm. Weight 1.6kg/set. 0.06w bulbs included.