Several years ago I used this texture on a Cigar pen using a CNC machine and a very sharp v-shaped cutter. The entire process was very slow and took about 1 1/2 hours per tube to carve in the very fine detail. I decided to try the texture again but this time using the 3D engraving functionality of the Epilog Helix. Using this method it took around 6 minutes to engrave the entire pen. The texture is based upon a 3D depth mapped image of actual tree bark. The wood for the body and cap is walnut and the nib section is ebony. The walnut made very nicely formed threads.