One end looked like wood with an emitter on the other side. But yeah I'll have to rewatch - it definitely looked long enough to be a double blade..

Only thing that makes me hesitant to say it's a lightsaber for sure is that I wouldn't think he'd just be carrying it around and have it out like that, as discrete as he's been so far. But as he's said, he's definitely getting more overt. That escape at the end of the episode DEFINITELY put the Empire on notice in an extremely non-discrete way...