The Ravens are using the low tender on center Matt Skura, as Mike Garafolo of NFL.com tweets. This will lock Skura in at a reasonable salary for the 2020 season, though they’ll receive no compensation if another team signs him as a restricted free agent and the Ravens do not match the offer. 
Skura is working his way back from a major knee injury, one that capped the starter at eleven games last year. After suffering ACL, MCL and PCL tears, Skura is still a few weeks away from running, though he hopes to be a participant in training camp this summer.
Before the injury, the 27-year-old had not missed a game since taking over for Ryan Jensen when he left for the Bucs in 2018. In fact, he never missed a snap. Skura played 1,889 snaps in that ’18 season and graded out as Pro Football Focus’ No. 12 overall center. If teams feel confident in his health, he seems likely to garner lots of interest and could even find a decent chunk of guaranteed money in an offer sheet.