The BIGJIGS Toys Natural Stacking Arches are made from smooth solid wood and coloured with non-toxic paint in neutral shades. The set contains 6 nesting arches as well as the inner block being a solid 3D semicircle. Perfect for open-ended play, children can learn colours, balancing, stacking or creating anything their imagination can invent! Largest arch measures 219 x 108mm. 3D semicircle measures 50 x 25mm.Age Suitability: 18 Months +