Produced from cane selected for it's specific proportiions, the V12 reeds have a thicker heel and are cut on a longer pallet with a slightly thicker tip than the Traditional.  The longer pallet means that more of the reed is vibrating, resulting a deeper, richer sound.  The thicker tip gives body to the attack and also increases the longevity of the reed.

#3 and #3.5 available.  Other strengths can be ordered.

Check out the "Vandoren Reed Comparison Chart" for which strength would work best for you:

http://www.vandoren.fr/en/reedcompar.html