Custom build and decorate your own 19" rocket with the Explorer X-19 model rocket kit. New $4.19 (30% off). SureFire Rockets has brought a new concept of educational rocket building to educators. The Explorer X-19 is the second in a line of rockets that gives the student control over both the look and design of his/her rocket. The Explorer does not include instructions or cut rocket fins. You print the instructions and the fin designs from this page. There are currently 4 different fin designs to choose from with more to come! By eliminating many of the high cost associated with producing rockets SureFire Rocket