Type of joint – the joints are made of brass coated steel. The steel rivet is visible. The joints are greased with mineral Vaseline for comfortable use of the ruler.

Surface treatment of wooden parts – double-layered water- soluble paint. UV environmentally friendly coating of the top layer protects the ruler from the effect of thinner.

Compact space of the ruler – the joints are embedded into the wood. Adjacent wooden parts form a compact surface for the smooth print. UV coating enables the wrong print to be washed away easily and replaced with different one.