LTT TAXIING AT NIGHT STRIKES 2 TXWY MARKERS WITH PROPELLERS.

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UPON COMPLETING THE AFTER LNDG CHKLIST; GND CTL TOLD ME (CAPT WAS TAXIING) TO TAXI TO THE RAMP VIA C; HOLD SHORT 14/32 LNDG TFC. COMPLIED WITH THE ABOVE; THEN TOLD TO CROSS 14/32 TO THE GATE. AS WE CROSSED 14/32 WE MET WITH COMPANY COMING OUT OF THE GATE AREA. THEY WERE TO USE A AND Y WHILE WE WERE TO USE C AND A (AT THIS TIME I CALLED STATION OPS TO GIVE OUR ON AND IN TIMES AND FUEL BURN WHILE CAPT WAS ON GND. I WAS BACK ON GND FREQ IN LESS THAN 1 MIN). BECAUSE COMPANY WAS TO SHARE THE SAME TXWY AREA; BOTH ACFT TURNED OFF OUR TAXI LIGHTS SO AS NOT TO BLIND ONE ANOTHER. AS THE CAPT TURNED LEFT TO GIVE ROOM FOR COMPANY; THE LEFT; THEN RIGHT PROPS HIT SOME TXWY REFLECTING TYPE MARKERS. I IMMEDIATELY JUMPED. CAPT THEN TURNED ON ALL LIGHTS TO SEE WHAT WE HAD HIT. WE THEN PROCEEDED TO THE GATE W/O FURTHER INCIDENT. THE MARKERS (A #10 CAN STUCK ON AN 18' POST); WHICH WERE SET UP TO MARK OFF AN AREA WHERE THE CONCRETE RAMP WAS CRUMBLING BAD; WERE FAR ENOUGH APART FOR US TO TAXI IN BTWN AND TO THE GATE. AFTER DEPLANING THE PAX; APPARENTLY NONE OF THEM EVEN NOTICED. I INSPECTED THE PROPS AND ACFT FOR DAMAGE. WE WERE TOLD LATER THAT 1 OUT OF 8 PROPS WAS DAMAGED--NOT AIRWORTHY. COMPANY REPLACED AND RERIGGED ALL 8 AND FLEW IT AS SCHEDULED. AS FOR THE MARKERS; NOTHING WAS MENTIONED IN THE CLASS I AND II NOTAMS; ATIS OR ARPT DIAGRAMS. I'M TOLD THAT WE ARE NOT THE FIRST ONES TO HIT THEM. THE MAJORS HAVE HIT THEM AND EVEN THE FUELERS LOCATED ON THE ARPT HAVE HIT THEM. ALTHOUGH I CALLED OPERATIONS ON THE GND--ACFT WAS STOPPED MOMENTARILY; THAT WAS NOT A CONTRIBUTING FACTOR. IF THE MARKERS COULD BE LIGHTED OR USE CONSTRUCTION TYPE AMBER FLASHING LIGHTS; THAT MAY HAVE PREVENTED US FROM HITTING THE MARKERS OR ANYONE IN THE PAST OR FUTURE.