"THIS NSN IS USED TO PURCHASE A MINIMUM OF 120 OR MORE CONTAINERS, TO PURCHASE A MINIMUM OF 1 TO A MAXIMUM OF 39 CONTAINERS USE 3439-01-397-1971TO PURCHASE A MINIMUM OF 40 TO A MAXIMUM OF 119 CONTAINERS USE NSN 3439-01- 407-7658. MATERIAL IS A FREE FLOWING, PRE-STABILIZED MAGNESIUM ZIRCONATE POWDER; CERTIFICATION: PWA1333G; RR9507/21."