4 DMM Wallnuts that are smaller than a Wallnut 1.
These microwires are made from a harder alloy than the regular Wallnuts as they must stand up to shearing out of the rock. Combined with a larger surface area (when compared to Brass wires), reduces the chance of the climbing nut being pulled through its placement.
Generally you will find that you will want a variety of micro protection, to give the best chance of getting the right choice of gear in small but often necessary placements. The DMM micro Wallnuts would be one of many suitable choices to fulfill your microwire selection.