Beiter Fluorescent Pins do collect light over the whole length and convect it on the front side: this makes the pin glowing!
Fluor Pins can be used - depending on their diameter - in Inserts #3 and #7 for Sight Tunnel Ø8mm respectively #13, #17, #18, #19 for Sight Tunnel Ø12mm.
HINT: Remove the Fluor Pin from the insert, every time you pack away your bow.
It is best to remove the Pin every time otherwise it is possible that it could drop from the Sight Tunnel while shooting; the plastic will not be affected.
To preserve the Pin, it is a good idea to simply put it into your Beiter Armguard!