All fuses in the box are made of ceramic+copper.
With a ceramic base that won't melt down when being used on a hot day.
Excellent Replacement Fuses for Classic Cars.
The ceramic/copper fuses instantly resolved some of the intermittent electrical gremlins that were happening (sunroof would not close sometimes, horn would not honk sometimes, buzzer and dash lights were inconsistent, etc).
When you have an old car you can't have enough.