Simple Atwood Machine, include Apparatus and 2 pulleys connected by a rod, 1.75inch plastic pulleys connected to a 3inch rod, Overall length is 8.25inch, Two pulleys are connected by a metal rod.
Robotics Smart Machines, Dimensions: 19.1 x 13 x 3.8in, Robotics is a vast, thrilling, and sometimes overwhelming interdisciplinary field involving physics, engineering, and computer science, This kit gives kids a simple, fun, and customizable introduction to robotics