Laminated birch wood. This material is much harder than either ebony or rosewood. Unlike in other wooden needles, water absorption in Symfonie wood needles is negligible and, as a result, there is no chance of warping. The same property makes our needles very strong, enables the points to be sharp and provides a lifetime of pleasurable use, if handled correctly. Please remember that all wooden needles in the lower ranges (2.0mm-3.5mm) should be treated with appropriate care.