LEGO Reddish Brown Cone 1 x 1 with Top Groove has been used in at least 240 LEGO sets over the past 18 years, since it was first used in 2006. You can also find this part in at least 81 other colours. It has a design ID of 59900 which can usually be found molded into the bottom of the part.
LEGO Reddish Brown Cone 1 x 1 with Top Groove (28701 / 59900)
/media/parts/photos/25/59900-25-4c4
LEGO Cone 1 x 1 with Top Groove (28701 / 59900)
Cone 1 x 1 with Top Groove : Part 4589b
LEGO Boutique Hotel Set 10297 Inventory
LEGO The Simpsons House Set 71006 Inventory
LEGO Reddish Brown Cone 1 x 1 with Top Groove (28701 / 59900)
LEGO Cone 1 x 1 (28701 / 59900)
/media/parts/photos/0/59900-0-6483e
Cone 1 x 1 with Top Groove : Part 4589b
LEGO Boutique Hotel Set 10297 Inventory
Cone 1x1 with Top Groove, Part# 4589b – Atlanta Brick Co
LEGO Door Rail Plates, Flat, Modified, Reddish Brown, No. 32028 / 20 Pieces