It's tuna mayo. Not listed separately in the app but the sub version is 17 syns. The bread is 9.5 syns and extra mayo as sauce (it's listed as serving suggestion, so I'm assuming it's included in the nutritional info) is 3 syns. So I would say just the tuna is at least 4.5 syns if you get the same portion size on the salad as in the sub.