These chairs are vey close the ones they are inspired by, the hardware provided for assemble is high end nickel-plated machine screws. 

The bases come pre-assembled and all that is required is the attachment of the base to the shell via 4 screws. I recommend starting all the screws by hand first then tightening them in a star pattern, the black tabs that connect the base to the shell move a bit to allow you to get them started. 

We ordered these in black and the shells are rougher in texture than we expected. But they are for a kids play room so they will easy to wipe down.