Select Classic frames - have 42 springy, forming a slight arc, slats of glued laminated wood placed in flexible brackets.They have adjustable hardness in the middle part of the frame and flexible shoulder part.Height of the frame 9-10cm.Available widths 80, 90.They can be used for all types of mattresses.For a 160x200 bed you need to buy 2 pieces of 80x200 frame, while for a 180x200 bed you need to buy 2 pieces of 90x200 frame.