This is extension for the Knight Castle to upgrade your castle to the next level.
 
It comes in 6 pieces that consist of:
-One big wall with archway: 20 x 4.5 x 14 cm
-One big wall with window and secret passage: 20 x 4.5 x 14 cm
-Two small walls with archway: 10 x 4.5 x 14 cm
-Two small walls with arrow slit: 10 x 4.5 x 14 cm