Traper's Secret series baits are developed for conditions where not only the composition of the bait matters but also its color. For example, it was observed that smaller fish (such as roach) prefer darker-colored bait, while larger fish prefer lighter baits. In addition to color, weather, water clarity, and other indicators affect fish preferences. In clearer water on a sunny day, darker baits generally work better (they resemble the color of the water bottom). However, for murky water, brighter colors are preferred: red, yellow. The Secret series offers the following colors: black, yellow, red, green. They are divided by fish species: bream, carp, tench, roach, roach.