Stefan or also known as 'short dart' or 'half length dart' within the Nerf community, is usually a 36mm variant of dart used by certain Nerf community. A standard Nerf dart is usually 7.2cm long in total, a stefan dart is usually only 3.6cm long in total. The reason of using a shorter dart is to reduce the drag due to the long foam of the dart, and to avoid fishtailing issue as the center mass of the dart is further back in a normal full length dart. Hence, stefan is often associated with high power blaster as they benefits more when paired with a higher FPS blaster. This is a normal misconception as we often seen 100-120FPS stefan blaster being used around in the field since they have a more stable flight path, they tends to be much more accurate that a normal length foam dart. Using a stefan blaster will usually requires a different magazine, and normal blaster usually unable to fire stefan dart without any modification. Few years back, the Nerf community are firing stefan dart using various kind of brass barrel based breech but nowadays, you can easily get high quality drop in stefan kit for your blaster and you are good to go.