Fine motor, color matching, shape shadow matching. Turned a couple of them sideways for a tiny bit of added difficulty. The wheel is also a good accompaniment to my many color matching sets or items found in the child's environment. Works on teaching the 12 shapes and colors I use in my preschool curriculum. The small fat clothes pins are easier for younger children to manipulate than a full sized clothes pin. Industrial adhesive vinyl, but not to be picked at. Natural wood products with their inherient variations. Choking hazards. Not for children under 3. You may also be interested in my Shapes curriculum download file.