Miscellaneous
Freefall Balls Accessory
Replacement spheres for the Discover Freefall System (ME-9889).
This set of balls is used with the Discover Freefall system. The special stickers are used to attach the metal washers to the plastic balls, allowing them to be suspended from a magnet.
https://www.pasco.com/products/lab-apparatus/mechanics/gravity-and-freefall/me-9890#specs-panel