Could be a typo on the specs in Apacs badminton UK. I dont think Apacs would make a 40T frame racket which take the same max tension of 35lbs as 30T frame. Even the most expensive high end Apacs like Virtuoso pro II are using 30T frame. I seriously doubt the 40T frame racket. I can't find any info about TX on Apacs official website, only from some online store in UK.