Package - ggsci
Novelty - No
Type - sequential

ggsci - grey_material

Github

nanxstats/ggsci

CRAN

ggsci

Use with paletteer package:

library(paletteer)
paletteer_d("ggsci::grey_material")

Use raw:

c("#FAFAFAFF", "#F5F5F5FF", "#EEEEEEFF", "#E0E0E0FF", "#BDBDBDFF", "#9E9E9EFF", "#757575FF", "#616161FF", "#424242FF", "#212121FF")