The throw data was captured by Wilson Sporting Goods. Metrics were collected through a variety of drills during the Wilson QBX combines where players threw footballs using Wilson QBX tracking technology embedded in each ball. More information can be found here - https://www.wilson.com/en-us/explore/labs/connected-football-system
Elite HS/College QB Averages | Julian Sarzo Data
Throw Release Time (s): 0.45 | 0.46
Throw Velocity (mph): 44 | 41.1
Throw Spin Rate (rpm): 612 |707
Throw Spiral Efficiency (%): 80 | 75