Formic Pro kills male and female varroa mites under capped brood as well as the varroa mites that are attached to the bees. Formic pro has an extended shelf life compared to Mite Away Quick Strips. Kills 83-97% of varroa mites in the hive. It is safe to treat during the honey flow as it leaves no residue on wax or in the honey. Formic pro's easy and ready to apply strips are made from raw, natural, and biodegradable materials that can be composted.