SENCUT's catalog is large enough that choosing between models can turn into spreadsheet work, so it helps to compare a few side by side. Three current folders cover the realistic range: the Sachse S21007-2, the Stria S25112-3, and the Serene S21022B-3. They share a budget price band and almost nothing else.
The Sachse S21007-2 is the full-size option, with a 3.47-inch drop-point blade in 9Cr18MoV stainless and a green Micarta handle. The blade carries a black stonewashed finish that hides the scratches any working knife accumulates. Overall length is 7.81 inches and weight is 3.59 ounces, which puts it firmly in the full-size folder category rather than the compact one. It opens two ways, via a flipper tab or a thumb stud, and closes with a button. Flat grind, drop-point profile, versatile for everyday utility — with the usual warning that the tip is not a pry bar.
The Stria S25112-3 is the lightest and most compact of the three: a 3.12-inch D2 blade in a blue canvas Micarta handle, 7.24 inches overall and only 2.53 ounces. Its straight-back blade profile and slim flat grind are aimed at efficient slicing rather than heavy work. D2 brings real wear resistance and edge retention, but it is not fully stainless, so the blade should be cleaned and dried after use, especially in humid conditions.
The Serene S21022B-3 takes the third route with an aluminum handle, which gives it a different feel in hand than the two Micarta knives and usually a different weight distribution. Comparing the three is mostly a question of what your pocket and your cutting actually look like: full-size and stainless, small and light with a non-stainless steel, or aluminum-bodied.
Verdict: pick by use case rather than by spec sheet. Cardboard and daily chores favor the Sachse; pocket-borne carry and light slicing favor the Stria; the Serene is the one to handle if you prefer a metal body. All three stay inside the budget bracket.