Estes Double Pack - B4-4 Engines x2 (6 Engines)

Two 3-packs of Estes B4-4 engines - six engines total. The right size when one pack is never enough for a launch day. Each 3-pack includes 4 starters and 4 starter plugs.

Ships via USPS Ground Advantage under our USPS hazmat authorization. A physical street address is required for delivery - rocket engines cannot be shipped to a PO Box. Follow the Estes safety code and all local rules, and supervise young rocketeers.