Dual Helix Zi's are definitely impressive. I luv mine. RGray also has two which is rare. One I believe is the Japanese version which is slightly different but I don't know the details.
My Velenos 38DD ti prototype
38DD ti 40DD ti sw 40DD ss bb
40DD da
44DD ti prototype
44DD ti
QDD ti
QDD ss # QD2 ss black QD2 ss sw
QD2 ss pol Helix Zi
Helix Zi JP
Dogbone ti Battery Case Steve Ku 2x Tritium Holder alm
Tag ti large dots Maze Tag ti RadHaz Tag ti Locator ti Helix Zi Bead Avant ti