The file contains 3 shelves all the same size.
Shelf dimensions:
Width: 67cm
Depth: 26 cm
Height: 45 cm
Link:
https://www.archiproducts.com/ru/products/b-line/shelf-fishbone_197593 
Description:
Modular shelf, can be positioned at 45 and 90 degrees, becoming more functional when used in pairs or multiple combinations.‎
Constructed from thin, curved sheet metal, it was originally designed with a laminated wood back, but is now also available with a fabric-covered back that creates a variety of color and tactile sensations.