Amstaff exercise bars.
These are weighted bars that you can use as a light squat weight or for many other exercises for upper and lower body and core.
Search for "weighted body bar workouts" if you are not familiar with using them.
I particularly like "bar fighting" where you touch your partners bars in the middle, rotate the bar 180 degrees and touch again.
Stenuous upper body workout?
The available bars are:
4 6lb (yellow),
2 9lb (blue),
4 12lb (purple),
5 15lb (green)
$10 per bar or $130 for all 15 bars.
All bars are 48" long with rubber end caps.
Diameter varies from about 1 1/8" up to 1 1/2".