Although he has not thrown an MLB pitch in 2018, Michael Pineda threw 10,963 pitches that were tracked by the PITCHf/x system between 2010 and 2017, including pitches thrown in the MLB Regular Season, the MLB Postseason and Spring Training. In 2017, he relied primarily on his Cutter (94mph) and Slider (86mph), also mixing in a Change (89mph). He also rarely threw a Sinker (94mph).
Basic description of 2017 pitches compared to other RHP:
His cutter is thrown at a speed that's borderline unfair, has surprisingly little cutting action and has good "rise". His slider generates a very high amount of groundballs compared to other pitchers' sliders, has primarily 12-6 movement and has some two-plane movement. His change is thrown extremely hard, generates fewer whiffs/swing compared to other pitchers' changeups, results in somewhat more groundballs compared to other pitchers' changeups and has slight armside fade. His sinker (take this with a grain of salt because he's only thrown 4 of them in 2017) is basically never swung at and missed compared to other pitchers' sinkers, is an extreme flyball pitch compared to other pitchers' sinkers, has well above average velo and has some natural sinking action.