Injectors MTU

E62A86BC-B470-44A8-90FC-F0FA4F6C1700D322A6B5-8BA2-4C35-A397-A6FC0797AD462E72FCE6-BCBF-437A-94B9-F62013048D93HELLOW friend 

i want to do a task to replace the injectors for my engine MTU, I buy 32 new injectors but I find that all this  injectors are marked with hand by a letter B.

please can someone explain me if this injectors are new or used.

see picture below 

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