extra soft, especially suitable for glasses, Swiss beech wood FSC, trim made of bio-based plastic, made entirely of renewable raw materials, the brush is all about sustainability, so the handle convinces not only thanks to its handy shape, but also by the high-quality Swiss FSC beech wood, the handle is stamped with bristles made of bio-based plastic, this means that the plastic is not made of petroleum but of renewable raw materials, in this case castor oil, in order to conserve natural resources, only the most necessary material is deliberately used for this brush, this brush is sustainable and effective ? from head to handle