Hard ARKANSAS Stone Triangle HAF-133 Ultra Fine 3/8"x 3"to 3-1/2" By Sticks & Stones Hard Arkansas,natural Arkansas Novaculite, Made In USA. upc.7300330, Dark Gray                                                 Hard Arkansas Stone Triangular File, 3" to 3 1/2" x 3/8" Inch File Triangular HF133 Ultra Fine Grit.    (typically made of natural Arkansas Novaculite)       sku.HAF3/8          Loc.H-3-6