These Italian Spaghetti chairs in the style of Giandomenico Belloti c 1970s are made of chromed steel and plastic. 

Design Period was between 1970 to 1979 Style Italian Modern, Minimalist, Modernist Very Good Condition — These vintage chairs remains fully functional, they do have age related minor wear to the Chrome Plating . 
Dimensions are ; Width 53 cm Depth 50 cm Height 80 cm .