These are the K2 r100 Frames. They run around $99 US. They’re machined out of extruded aluminum which makes them extremely solid. They’re UFS and are designed to fit four 100mm wheels.
These are the Kizer Arrow frames. They’ll run you around $90 US. They’re UFS and fit up to an 80mm wheel. This means they’re perfect for aggressive skaters interested in trying big wheel blading.