Grimm's Concave finds Convex. Tricky building game in which the matching two parts are to be found. As a tactile variation, put the pieces in a bag and find the matching parts through the sense of touch. The individual parts have interesting and unusual shapes so they are also ideal for outdoor play and imaginative building. 4 parts, L = 6 12 cm, H = 2. 5 cm, lime wood, non toxic water based color stain recommendation age: 4+ WARNING: CHOKING HAZARD Small parts. Not for children under 3 yrs. UNIQUE MARKINGS: We love wood because it is a natural material so it always has various markings that show up in our products, making each one unique. Grimms 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. Discover the markings that make your Grimms toy Simply Unique! 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 on the rainbow 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 for us, but quality features of a natural product and as such are desired and welcome by us. We love this uniqueness of wood!