1x4 Sensor-Cleaner wet + dry non full size. Sensor cleaning kit for non-full-frame cameras. The correct amount of Wet Foam is essential for safe application. The special surface of the Dry Sweeper ensures streak-free cleaning. Wet Foam is grease-dissolving, non-toxic, non-flammable, and there is no risk of overdose or overflowing liquid. Safe to use. Features of the Dry Sweeper: used immediately after Wet Foam to lift away the dissolved dirt. The silk derivative cloth is fixed using a special technique. It is highly absorbent and lint-free. The pre-treated cloth cleans without streaks.