The Call Up EP 350 | What Makes a Fastball Great? Plus, More Rule 5 Prospects Aram and Jack dive into the world of heaters as they discuss the key data and visual characteristics that make fastballs shine. Then, they continue discussing the Rule 5 Draft with more prospects to keep an eye on during next week's draft. Listen wherever you get your podcasts! _____ #mlb #milb #baseball #mlbprospects #majorleaguebaseball #minorleaguebaseball #rule5