Package - ggthemes
Novelty - No
Type - qualitative

ggthemes - Classic_Gray_5

Github

jrnold/ggthemes

CRAN

ggthemes

Use with paletteer package:

library(paletteer)
paletteer_d("ggthemes::Classic_Gray_5")

Use raw:

c("#60636AFF", "#A5ACAFFF", "#414451FF", "#8F8782FF", "#CFCFCFFF")