05-06 UT = reinforced edge thingy
05-06 HP triplets= faster base, different flex pattern and no reinforcment edge thingy
06-07 UT= Sidewall construction, true symetrical twin tip with flex points for nose and tails.
06-07 hp triplet= fast base different flex paatern beta construction (same as this year)
rivets all over the place too on pretty much everymodel.