Federleisten ( spring boards used in beds under the mattress to the the swinging feeling)
> Thickness: 8 mm i.d.R.
> With: 25-105 mm
> common measurment: 53 mm
> Length: 510 mm - 1370 mmm
> Number of layers: 5 or 7
> Thickness of each layer:
> at 7 layers: 1,2 mm
> with 5 layers: 1,6 mm
>
> Radius of the board: 3800 - 4000
> surface: coating like sap of a tree
> no coulouring
>
> Foil material: beech or birch
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