These are the load balancing weights for our New Holland skid loader. They hook onto the rear of the machine to add weight for when you are lifting a heavy load. It keeps it from tipping forward but it also makes the machine more susceptible to flipping backwards if you drive it up a steep hill or trailer.
They have been in the back of my truck for two years. They weigh 26kg apiece.
The yellow reminds me of the highlighter I used in my old Bible.
