X Stool is an essential stool. 

It is made using two “X-shaped” items obtained by laser cutting an aluminium plate 2 cm in thickness.
 The two “Xs” are spaced sufficiently apart to ensure a stable seat and are joined by two steel cylinders which stretch the fabric of the seat and two crosspieces integrated into the outlines of the stool itself.

Dimensions are calibrated so it can also be used as a support for a BBX 66.