Machined from solid 6061 tool stock aluminum for long life and designed for use with our phenolic motor casings listed above. Each set contains base, four propellant coring spindles (two each of two diameters), pulling handle, centering rings, 10 delay element liners and compression ram and complete instructions (propellant formulae not included). You can machineyour own nozzles out of graphite, phenolic, fiberglass or they can be made with our nozzle forming tool sets listed below.