Approx 130x15mm. Approximate because of the shape of the bridge. A bit smaller than a standard oud bridge, but bigger (and thicker) than a lute one. String tension depends on tuning.
There actually are no records surviving of how medieval lutes were tuned.
I currently have it tuned as a ronrocco (large charango), so d'd' g'g' b'b e'e' b'b'.