Before each launch you'll have to buy a reload kit. In this kit you'll find a number of 'grains' of fuel (for a 180mm casing usually 3 grains, 240mm = 4 grains), a cardboard casing liner (burns away during flight), some O-rings (better not to re-use), a nozzle (gets worn during flight), some black powder for ejection charge (it is better to have your own as the supplied amount is a bit small), an igniter (it is better to have your own as the copperhead type isn't as good as other models), a delay element, some spacer rings and a manual. In the manual is indicated what reload kit is included and what delay element (short = 6s, medium = 10s, long = 14s).