Bulk packed Estes rockets for an exciting camp project. Simple construction with die-cut fins and simple painting. Be sure to buy at least two engines for each rocket kit since Space Ex MB requires two launches and the campers will want to do even more. When you buy 12 rockets you should buy at least one box of 24 engines to equal the required two launches. That is, one box of rockets (12 pack) and one box of engines (24 pack). Engines must be shipped ground USPS, 4-10 days.