total 5 rails(slats) and 11 shelves total. 
Amazing simple Kai Kristiansen's shelving unit. 
Photos show only 3 rails installed. with 2 more slats installed, will be larger set up.
 
each Slat(rail) length:59"
Shelf: 33x7x2.5"
Total pieces dimensions when installed all: 132"Wx7"Dx 66"H