The Kerbal Launch System, commonly called the KSL, has four solid rocket boosters that aid in initial takeoff, with a large center booster for the general heavy lifting. This portion of the rocket takes up roughly 75% of the total mass. Moving up, the orbital insertion and ejection stage makes up another 10% of the craft, with a payload bay encompassing roughly 15% of the craft. The vessel is noted to carry large payloads to Low Kerbin Orbit, and even past its sphere of influence. Furthermore, it is drastically cheaper than the Astra Sailor to produce, coming in around at a ration of 6 KSL's per every 1 Astra Sailor. The downside, though, is that it is not reusable at all, while the Astra Sailor is fully reusable.