DR Strings Hi-Beam - Stainless Steel Round Core Medium 5 String 45-125

What is the difference between these high beams and the fat beams?

Are these 45-125 or 45-120?

will these work on a 35" neck with string thru body,I used the DR legend strings now and they fit and they are great strings ,but want to try the high

Does it have a tapered B string?