<https://www.phywe.com/physics/mechanics/dynamics-motion/pulley-movable-dia-40mm-w-hook_653_1584/1584>
<http://schema.org/description>
"Function and Applications For demonstration of movable pulleys and for construction of simple tackles. Equipment and technical data Pulley with band channel and load hook. Material: plastic, yellow. Diameter: 40 mm. "
<https://www.phywe.com/physics/mechanics/dynamics-motion/pulley-movable-dia-40mm-w-hook_653_1584/>