3 x LED and 1 x 600mA battery on each rock. 0.06w for each LED. Polyresin. Energy efficient. 10,000- 12,000MCD lumen output. Life of bulb 6,000hrs. Spike fitting. Size (H)15.5, (W)12.5, (D)11.5cm. Weight 1.68kg/ set. Includes 3 x LED in each rock and 12 x LED in 4 piece set pack.