Gt shafts are weird that some 7595 are 340 and some are 300.  They are moving to the numbered spine 500, 400, 340, 300 to eliminate that confusion.

S.C.  
I've shot these shafts from inception, shot many animals with them, and they are a straight up solid shafts designed around the traditional archer with all of the available components.   Weight tubes, collars, unibushings, nock adapters, brass inserts, glue in broadhead adapters and so on make them a great platform for a perfect carbon arrow.  I really do like them and a great shaft partnered up with Easton   Dino

I've have been using the Traditional Only shafts for everything but super heavy game since they came out in 2009. I like to use the G nocks and adaptor and carbon collars. They have been super consistent, smooth, and dependable.