Lady Isabelle counts the hours using steel balls that strike a crystal goblet. The balls automatically go back to the top via a unique ball jack. She will run over 24hrs on a wind depending on height. She runs well on about 7 pounds. The perimeter Ring Wheel is 18” diameter so this clock has an assertive presence in the room and is certainly a compliment magnet. This clock is a suitable project for a skilled craftsman. Every time she announces the hour, she will bring a smile to your face.