These shelves are made of reclaimed wood. The shelf shown is 10" deep with 24" and 38" shelves. The distance between shelves is 1'. The shelf can have more or less levels, with shelves of varying sizes. Other types of wood's can also be used.
The shelves are held together with screws, which allows them to be shipped disassembled which is cheaper. But the shelves can also be glued together.