Although he has not thrown an MLB pitch in 2020, David Hess threw 3,178 pitches that were tracked by the PITCHf/x system between 2018 and 2019, all of them occuring in the MLB Regular Season. In 2019, he relied primarily on his Fourseam Fastball (93mph) and Slider (84mph), also mixing in a Change (86mph) and Sinker (93mph). He also rarely threw a Curve (78mph).
Basic description of 2019 pitches compared to other RHP:
His fourseam fastball has less armside movement than typical and has essentially average velo. His slider is an extreme flyball pitch compared to other pitchers' sliders. His change is basically never swung at and missed compared to other pitchers' changeups and is slightly firmer than usual. His sinker has less armside run than typical and has little sinking action compared to a true sinker. His curve has little depth and results in somewhat more flyballs compared to other pitchers' curves.