The vanes of the trimmer are stacked on a sturdy plastic base. The color of the base indicates the maximum capacitance. The dielectric is a film of polypropylene (PP), polycarbonate (PC) or polytetrafluorethylene (PTFE), which supports the vanes in such a way that good stability is ensured and no microphony can occur.
Flux absorption between the vanes is prevented.
Cleaning with solvents is not advised.
Versions are available with either a vertical spindle, or a horizontal spindle.
Both versions have top adjustment by means of a screwdriver or trimming key and bottom adjustment by means of a key.