Package - ggthemes
Novelty - No
Type - qualitative
ggthemes - Classic_Gray_5
Use with paletteer package:
library(paletteer)
paletteer_d("ggthemes::Classic_Gray_5")
Use raw:
c("#60636AFF", "#A5ACAFFF", "#414451FF", "#8F8782FF", "#CFCFCFFF")