2-Pack Origami Pop It R1407 Shelves

Anyone know the weight limit per shelf and per unit?

175 lbs Per shelf on level surface

Reviewed on Amazon: R1407 Shelves by Origami - Search

According to the product description on amazon:

Weight Capacity Per Shelf: 175 lbs with a total weight capacity of 700 lbs

I bought a pair of these in May of last year, and they came with the wheels. Either I just got lucky, or the description is incorrect. YMMV.