[Small square pool]

[Medium square pool]

[Large square pool]

This device shows a series of pendulum balls to save momentum and energy. Pull one or more of the balance balls back and release the same number of balls will swing up on the other side.

Function:
Pull one or more of the balance balls back and release the same number of balls swing on the opposite side. This desktop toy provides a lot of entertainment suitable for various places such as home and office. When you are tired of learning or working, you can put it on your own desk. This is a cool and nice desk decoration for the office. An excellent educational science tool not only indicates pendulum but also represents the conservation of momentum and energy. Suitable for home decoration, study or office table and chair decoration accessories. Also suitable for birthday gifts and childrens toys.

Specifications:
Condition: 100% Brand New
Material: ABS plastic, fish line, solid metal ball
Size: S, M, L (optional)
Small:
Base Size: Approx. 7.3 x 8.8 cm/2.9 x3.5 inch
Height with base: approx. 9.4cm/3.7in
Frame Size: Approx. 8*7cm/3.2*2.8"
Size M:
14 x 11.5 x 14.5 cm/5.5 x 4.5 x5.7 inch
Large:
Approximately 17.5 x 14.7 x