Family Expert frames - have 28 resilient slats, forming a light arch, made of laminated wood placed in flexible brackets. They have a middle belt to ensure even pressure distribution and hardness adjustment in the middle part of the frame. The height of the frame is 6-7cm. Available in widths of 80, 90, 100, 120, 140.The Expert frame has manual adjustment of the bolster and footrest. 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. They can be used for non-spring mattresses, such as latex and foam mattresses.