Formic Pro™ the next generation in formic acid treatments and is used to treat hives with varroosis, caused by varroa destructor in honey bees. Unlike Mite Away Quick Strips, Formic Pro™ has a longer shelf life of 24 months and no temperature requirements for storage. Daytime temperatures still must be between 50° F – 84° F (10° C- 29° C) when used.Strips are laid across the tops of the brood frames. Safe to use during the honey flow! A spacer rim is no longer needed for these strips, but you still need to wear the recommended safety equipment for acid.