Solid fuel refill kit for 24mm Aerotech RMS engine casing. Blue Thunder fuel formulation (bright blue flame, almost smokeless). Medium delay (7 secs.). 3 refills to a package. Availability: Usually ships in 2-3 business days 9443352807Our price: $24.99Sale price: $22.49 Copyright © 2006-2012 Heavenly Hobbies LLC. All Rights Reserved.