![Pendulum ball, hard plastics, D40 mm Pendulum ball, hard plastics, D40 mm](https://shop-ntl.com/8481-home_default/pendulum-bobs-with-hooks-d1-set-of-6.jpg)
![Pendulum ball, hard plastics, D40 mm Pendulum ball, hard plastics, D40 mm](https://shop-ntl.com/8482-home_default/pendulum-bobs-with-hooks-d1-set-of-6.jpg)
![Pendulum ball, hard plastics, D40 mm Pendulum ball, hard plastics, D40 mm](https://shop-ntl.com/8483-home_default/pendulum-bobs-with-hooks-d1-set-of-6.jpg)
![Pendulum ball, hard plastics, D40 mm Pendulum ball, hard plastics, D40 mm](https://shop-ntl.com/8484-home_default/pendulum-bobs-with-hooks-d1-set-of-6.jpg)
![Pendulum ball, hard plastics, D40 mm Pendulum ball, hard plastics, D40 mm](https://shop-ntl.com/8485-home_default/pendulum-bobs-with-hooks-d1-set-of-6.jpg)
For experiments on sound propagation and resonance,
by lightly touching a vibrating membrane or tuning fork, the ball is impressively repelled;
Pendulum ball with suspension thread
Material: hard plastic, coloured
Diameter: 40 mm
Thread length: approx. 65 cm
Weight: approx. 3 g