Printronix Auto ID T400 Administrator's Manual page 12

Label length
Gap height
Black mark height
Black mark width
-
10 mm ~ max. for normal printing
1" ~ 6" for peeler mode
1" ~ max. for cutter mode
Min. 2 mm
Min. 2 mm
Min. 16 mm
5 - P220 123-0 0 1_ C