Flown deployed parachute line cutter from the Space Shuttle solid rocket booster assembly, 8.5″ x 2″ x 1.25″, marked on one side, "Space Ordnance Systems, MMC SPEC PD6000207-002, NASA PPCI PN 4158-507, SOS PN 115460-203, SN 1594 LN AAC DOM 10-84, 10 Sec Delay Cutter." Decommissioned for further flight with red spray paint, with opposite side marked "#40, 8013." In fine condition, with expected signs of use and wear. Accompanied by a page explaining the function of the line cutter.