Cobb is working with four pitches this year. He'll throw two types of 91 mph fastballs, one that's pretty straight (four-seam grip) and another that sinks and tails (two-seam grip). His primary offspeed pitch is a mid-80s splitter (picture here) that often dives straight down but sometimes moves more like a sinker (the few that appear to be cutting are due to some calibration offsets at Tropicana Field). He also has a high 70s curveball in his arsenal. He hasn't been great at missing bats, and his control is suspect. He will, however, get the ball on the ground with all of his pitches but the four-seamer. Charts and graphs are below; click the graphs to enlarge them.
Looking at pitch heights split into five different zones (below the zone, low in the zone, middle, high in the zone, above the zone), we can see that Cobb keeps his four-seamer up, his sinker a little lower, and his offspeed stuff low.