This line is a hybrid of the Flagship and Tomb Warrior lines of swords with custom file work on the D-Guard.
This sword design (combining the flagship and tomb-warrior lines) was based around Sifu German Ferrer's request and was a custom project for him. You can read more about it on the blog, here:
https://www.shopwingchun.com/interview-german-ferrer-on-his-customized-butterfly-swords This line has the best of both worlds: These weapons are full tang swords. They have the angled handle for more power and bio-mechanical alignment of the wrist. They have the ability to chop, stab, slice, trap, and flip effectively. They have the spiked D-Guard from the Wing Chun Warrior's Tomb to help keep weapons from slipping under the guard and add penetration power to punches... And they have some custom file work to make them look great!