Machined from aluminum tool stock, this three piece set produces a rocket motor with a core and nozzle and a tangenital side vent for ignition. No airframe or fins needed! Upon ignition, the motor starts spinning much like a buzz bomb, then the core ignites sending it rapidly into the air up to 1000 ft with a loud thrumming sound. Uses our 3/4" ID X 24" long tubes (stock # GTP34/24) cut into 3 1/2" lengths, nozzle clay and either whistle mix or "black powder" type rocket propellant. Can be loaded with star mix or flash for nighttime effects. Launched from an upright nail in wood base. NEVER POUND WHISTLE MIX TO COMPRESS! IT IS WAY TOO SENSITIVE! ALWAYS USE A HYDRAULIC PRESS FOR CONSTANT PRESSURE WITHOUT THE 'SHOCK' OF HAMMERING!