Please note that all Raduga Grez pieces are made from real wood. As wood is a natural material, there can be various markings that show up the pieces, making each one unique. Radua Grez toys are always one of a kind, carrying unique marks made by nature. Wood grain has changing structures and colours which serve as proof of its natural origins. The unique variations are proof of quality, not defects.
Every piece of wood has its own appearance, its own character and its own vitality. Its natural characteristics, and unique markings are therefore always to be considered. For example, dark spots are caused by mineral deposits. This means that if the tree had grown further, a branch would have developed at this point.
Black stripes are also something completely natural. This is the so-called pith tube or "heart of the tree". It differs from the surrounding wood by the darker colour and structure. When working on the wood, it can become completely or partially visible. This feature is part of the natural appearance of the wood. Therefore, these are not defects, but quality features of a natural product and as such are desired and welcomed by us.