My favorite Skull beads in a nice-quality Magnesite that has been dyed a Turquoise Blue/Green.
They are heated to keep the color, so no worries on color rub-off.
The striations are natural and random, with some beads having more than others. The striations are brown in color, as is the inlay on the eye sockets, nose, and teeth.
The size is approximately 18x13mm each.
They are drilled down through the center of the top of the head, and down through to where the 'neck' would be (if they had one ;)
This is a full strand of 22 Skulls total.
These would make a great addition to your Dia de los Muertos costume!