This pack contains 10 excellently detailed hollow brick stacks.
 
Each stack measures:
N gauge: 8mm, 8.4mm, 8.3mm
TT:120: 9.6mm, 10mm, 10mm
TT:3mm: 12mm, 12.6mm, 12.5mm
00 gauge: 16mm, 16.8mm, 16.6mm