European - Style Bedroom Office Newton Pendulum Desktop Decorations - Black

Demonstrates Newton's Laws of Motion,Own your special piece of science and explore significant values of physics.
The balls continue in perpetual motion FOR ONLY 15-25 SECONDS due to the resistance of the air and friction.
Great science gift idea for your sweetheart at birthday, Christmas, Children's day and other festivals.
A perfect decoration and teaching tools.
Features:

Name: Desktop Decoration
material: metal
Weight: 200g
Size: 9x7.5x9.5cm
Estimated delivery time：About 10 business days.We will use standard shipment for the orders. Normally it may need about 10 days, but sometimes please note: Delivery times are as provided by our carriers and are estimates only. Delays may occur during peak periods, and due to factors outside the carriers control.