The base set consists of over 38 pieces of doors / gates, bases + 5 bonus models
Dimensions:
The three biggest tiles are 152.4mm x 152.4mm tiles, follow by the 50.8mm x 50.8mm, 50.8mm x 25.4mm, 76.2mm x 25.4mm and finally the smallest square tiles are 25.4mm x 25.4mm.