This pack contains one model of a three by three stack.
 
N gauge short pipes length - 33mm
N gauge long pipes length - 65mm
 
TT120 short pipe length - 41mm
TT120 long pipe length - 82mm
 
TT3mm short pipe length - 49.5mm
TT3mm long pipe length - 99mm
 
00 short pipes length - 66mm
00 long pipes length - 130mm