This is a great accessory set, that can be added to any Kullerbu configuration. It adds a fantastic musical effect with dangling bell. Allowing for greater creative play. Includes: archway with bell and 2 base pieces, 1 cat ball, and 1 yellow ball. This set is made in Germany. In addition to carefully selected materials and high-quality craftsmanship, the issue of safety is of highest priority at HABA. Kullerbu products, like all HABA wooden toys, pass through our in-house quality assurance as well as external test procedures. All Kullerbu balls have an extra large diameter of 4.6 cm/1.8 inches, so that they cannot be swallowed by children, especially by those under 3 years of age.