Mugen Seki has long been known for its World Champion On and Off Road R/C racing cars. They also make a couple of World Class Starter Boxes for On and Off Road racing cars. I had the pleasure to review the BII Off-road starter box with several different cars and engines. I was extremely impressed with its compact size, durability and its very strong starting capabilities. The construction of the box consists of a combination of materials that make for an over-all quality product. The main housing and lid of the box is composed of aluminum. The end caps and carry handle are a high impact plastic. The contact points for the switch are brass and copper, making for excellent and trouble free operation. Its outside dimensions are 11.5" long, 5" wide and 3" tall.