Check the listing for details. Brass Pendulum Bob with Threads,2-inch Diameter Solid Brass. Condition: New. Listed at 7.50 USD. The Brass Pendulum Bob with Threads is a solid brass bob with a diameter of 2 inches, designed for use with a pendulum to create a swinging motion. This product offers a quality and unique addition to educational and study materials. The brass construction adds a touch of elegance and durability to the pendulum, making it a reliable tool for testing and demonstration purposes. Some tarnish on them.#415The Brass Pendulum Bob with Threads is a solid brass bob with a diameter of 2 inches, designed for use with a pendulum to create a swinging motion. This product offers a quality and unique addition to educational and study materials. The brass construction adds a touch of elegance and durability to the pendulum, making it a reliable tool for testing and demonstration purposes. Some tarnish on them.#415