No wraps can be counted as a HEX on any day I'm afraid.
Use the 1 syn = 20 calories rule to work out syns as there is no free food allowance.
Lowest syn wrap that I know of is the small ASDA wholemeal wraps at 4.5 syns. Confusingly in my ASDA store you find them in the mexican/world food aisle - the ones in the bakery aisles are much bigger and higher syns. Packaging is almost identical though, just different sizes.