The TwoSun TS999 kitchen knife comes with mono steel construction. The G10 handle comes with one mosaic rivet in the middle.
TwoSun TS999 Chef’s knife 14c28n Core Material
The TwoSun TS999 Chef’s knife comes with a 14c28n core material. TwoSun has no information about the knife steel and Rockwell hardness. But during my testing, the knife hardness is around 59 or slightly higher.
Edge durability & sharpened angle
The knife is sharpened at a 17-degree angle per side. This angle gives the knife extra durability without sacrificing the sharpness. The 14c28n steel is tough and durable. It should not be a problem to go through a fish spine.
With a Rockwell of 59, the knife can hold the edge for around five months with regular honing sessions before needing whetstone maintenance.
Weight and Spine tapering
The knife comes with a spine taper of 2.8mm at the heel, 2.5mm in the middle, and 1.9mm at the front, measured before the slanted tip.
TwoSun TS999 Flex
The knife is very stiff, and there is no flex because of the mono steel construction of the TwoSun knife.
Because of the general handle design, it will be comfortable for a wider audience. There are no unique curves to favor a specific gripping style. However, with the diagonal bolster, the best gripping style would be a pinch grip at the bolster area.
Knife balance point
The balance point of this knife is at the back of the diagonal bolster. With a pinch grip at the bolster, the knife will be back heavy.
Blade profile & weight
The blade profile is very curved, and it works great for those that prefer to rock. Combined with the balance point and the knife’s weight of 288 grams, it will assist you with your cutting motion.
You don’t have to worry about the knuckle clearance since it will have enough clearance with all gripping styles.
Final Conclusion and my Recommendation
The TwoSun TS999 is not the best-looking or the fanciest knife out there. However, they deliver on every single aspect of what I expect from a Chef’s knife. The biggest surprise is the 14c28n steel. The 14c28n has decent edge retention and good rust resistance properties. The steel is strong enough to withstand some abuse. The 17 degrees sharpened angle is a welcoming factor since we see more and more knife manufacturers pushing for a lower sharpened angle which is not always the best based on the knife steel type and knife style.
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The 14C28N steel is the biggest surprise, I like the steel a lot and it can hold the edge for a longer period than an X50CrMoV15 or 440C, Friodur Steel. (Better edge retention than a Wusthof Ikon Classic and Zwilling Pro).