Description: Smoke pump case is CNC treated 6061, anodized aluminum. Anti-fuel nylon with fiberglass filled gear Two high speed oil seals made in Japan ensure the pump is stable, wear-resistant and long lasting. Brushless motor/ESC provides smooth transmission and avoids the potential of spark Ensure the pump is working safely. The whole set weighs only 94g. Recommended items (need to be purchased separately): Battery: 7.2V 6 cells NiMH, 7.4V 2SLi-Po, 6.6V 2 cells A123 fuel tank: 500-600cc blue and red.