Solid, metal free* solid wood bed slats (linden) that carry any mattress with decent breathability.
The lateral frame has a height of 8cm, containing 5cm x 2cm slats with 3.8cm gaps in-between.
Frames are always about 4cm shorter and roughly 1cm narrower than the nominal dimensions, so they fit into the matching bed frame.
This frame can - as opposed to the roll-up slats - also be used in beds without slatted frame support. It reduces the inlay depth of the bed by 8cm.