The JET RSB have a revised tip angle, revised jet shoulder width and revised internal geometry, with a gentle slope leading down to the exit. They are also slippery inside, due to a special treatment. PRINT 3-5 degrees lower because they are so slippery inside, to eliminate dripping.
JET RSB nozzle is available in sizes:
WHY JET RSB? - These new nozzles are meant for Speed! Plastic will flow more easily than in most other nozzles. Atomic pulls work very well! The inside geometry makes it much harder for plastic to hide in the corners, so changing color/filament type will be quicker and safer.