These building rings along with our small and large solid wooden balls (10239, 10238, 93120) enable amazing building and stacking possibilities and much more! This is how fir tree forests can be made, how spherical towers can grow into the sky and how our rainbow friends can turn into rainbow-pile acrobats. 24 wooden rings in 2 sizes, 12 x inside Ø 20 mm, 12 x inside Ø 30 mm, wood: maple, varnished in color