When you want a blank that'll get noticed, this is the one for you. Made with neon pigments, this hot pink blank is BRIGHT and will fluoresce in black light. After drilling, you can paint inside the blank with a neutral silver to retain the brightness. White will work but might lighten the color a bit depending on how thin the finished pen is.
Slim Blanks measure about .6" x 5" and are suitable for slimlines and pretty much any pen around .5" finished diameter. Drilling on the lathe is your best bet to ensure you maximize the diameter.