The seller supplied the following interesting description of these tubes:The zirconium tubes are the ends of a long piece of tubing lathed into shorter lengths for the purpose of placing pellets of U238 for reactor function.
A trigger event. Many people experience a general thinning of hair several months after a physical or emotional shock. This type of hair loss is temporary. Examples of trigger events include sudden or excessive weight loss, a high fever, surgery, or a death in the family.
Thus resulting shedding of scalp hair & thin eyebrows. Another potent reason responsible for thin eyebrows are frequent hair waxing from the brows. Frequent waxing, plucking or threading of hair from the eyebrows lead to the progression of the medical condition called traction alopecia.