Rainbow Architect Arches are beautiful smooth solid beechwood nesting arches in the seven colours of the rainbow. They have a natural finish to show the grain of the wood, with the inner block a solid 3D semicircle.Ideal for construction and imaginative playGreat for exploring size and scale and using mathematical language - larger, smaller, taller, steeperHeights: 19mm, 27mm, 36mm, 47mm, 56mm, 63mm and 73mm. Lengths: 40mm, 58mm, 76mm, 94mm, 112mm, 130mm and 148mm. Wall thickness 8mm x Width 40mm.Age suitability: 12 months +