Birch rail with pegs. The distance between the hooks is the same on both lengths, allowing  you to group multiples together to get the desired length.
 
screws included
 
Dimension:
7 peg - 26.5" L x 3"H
4 peg – 15″ L x 3″ H
2 peg – 7.5″ L x 3″ H
 
Material: Birch
Made in Sweden