The dimensions that the thermal paper needs to be in, or alternatively, the thermal printing tape, vary depending on the model of the card terminal.
Specifically:

Card terminal model

Width 

diameter 

A80 

58 mm 

50 mm 

A920, A910

58 mm 

40 mm 

S900 

58 mm 

40 mm 

S800

58 mm 

50 mm 

Android NEXT

58 mm

40 mm

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