The Callisto, along with her big sister Ariel, is one of my favorite rockets in my Loc/PML fleet (I have many!). The Callisto is a sleek dart, yet has a large enough diameter to fit in electronics such as altimeters and flight trackers. Callisto is capable of using a wide variety of budget friendly motors that will take it from 500-5000'. It's a great platform for learning the ins and outs of high power rocketry, from how to assemble reusable motors, to how to install electronics in a nosecone (see Loc's Intel-cone on this website). A fantastic performer that will deliver hours of fun!