Froebel 9 includes 6 colors rings and half rings, total 216pcs. inner diameter 2.5cm rings,6pcs/color; inner diameter 3.75cm rings,6pcs/color; inner diameter 5cm rings,6pcs/color; inner diameter 2.5cm half rings,6pcs/color; inner diameter 3.75cm half rings,6pcs/color; inner diameter 5cm half rings,6pcs/color. Froebel 9 represents the edges or outlines of these objects, curved lines. 
Use high quality beech wood box for storage it. Smooth varnished, water base painting, Eco for all kids. The Froebel Gifts are good educational toys for kindergarten. they certainly were the first materials designed for child development, as Kindergarten was the original preschool method. Also can sell the inner parts separately or do OEM order.