Estes Rockets - Tandem-X Rocket Launch Set, Amazon (E2X) & Crossfire ISX (Skill Level 1) Batteries Universal They allow the end user

They allow the end user to find their perfect weight bias to aid Rock Crawling

Improves power transfer efficiency and lessens the likelihood of motor overheating

6V / 1800mAh w/ Balancer Plug)

it was a fixture on the global rally circuit from the 1950s through to the 1980s

Estes Rockets - Tandem-X Rocket Launch Set, Amazon (E2X) & Crossfire ISX (Skill Level 1) Batteries Universal They allow the end userTwo is better than one! This exceptional rocket set features a pair of extreme, high performance rockets and a launch system. The E2X Amazon is as imposing as the name sounds. This giant stands almost 30 inches tall, and is quick and easy to build! A black body tube, precolored plastic nose cone and fins, and tiger striped self stick decals make building this rocket easy to do in about an hour. When flown on standard engines, this huge rocket can