Not sure I've handled a TW (stands for "teeny weeny"), but I don't doubt the 4" length. Mine is along the lines of the #4, at around 6" overall. It only cost around $20 when I got it several years back. The product line has changed somewhat in the intervening years.

The TW intrigued me, but 4" is just too small for my hands. The 6" on the one I have is about the minimum for me, and I find an OAL of 7" works better.

Anza knives aren't particularly pretty, but they're tough, sharp, & a good value.

David