H51S Newton's Cradle Balance Balls Science Pendulum Desktop Toy - Red Brown + Silver

Pros: It is small, quite light but well built. Size very conveniable for having on a small working table (as long as it does not annoy office colleages). Spanish: Pequeño, ligero pero bien construido. Muy aconsejable para tener en una mesa de trabajo pequeña (siempre y cuando no moleste a otros compañeros)

Cons: The fact of being small and light, makes that the cinnetic movement does not keep a lot, so if you want it to keep moving you have to pick the metal balls every now and then. Spanish: el hecho de ser pequeño y ligero, hace que la energía cinética no se mantenga demasiado, así que si quieres que se mantenga en movimiento tienes que tirar de las bolas

Other: even if it's not the best thing in the world, it makes its function: decoration and stress reliever. Nice product Spanish: incluso si no es el mejor del mundo, cumple su función a la perfección: decoración y anti-stress Buen producto

Pros: She works. It took about a minute to assemble and start testing the laws of physics. Fun little thing (emphasis on little, see below) and good looking.

Cons: Outside of the metal on the balls, everything is made of plastic... including the base and arches that support the hanging balls. The balls themselves are quite small, consequently they lose inertia quickly.

Other: This is a fun little desk topper that people love to toy with when they stop by. For the price, you won't be upset by the size.