. stairs : spiral, helical round
. frame : round central pole in stainless steel or lacquered steel + in exterior one or several lateral glass piece(s) (diagonal or basing on the ground or suspended), or, lateral beam in stainless steel or lacquered steel, or, fixations directly on a solid wall
. steps : glass / wood (oak, beech or other on demand) / stainless steel / lacquered steel
. railing :  glass and stainless steel / stainless steel / glass and lacquered steel / lacquered steel