Formic pro treatment strips each have 68.2 grams of the active ingredient formic acid. This is toxic to the varroa mites but not to the bees. The rest of the strip is made of polysaccharide gel which acts as the platform to release the formic acid vapours as well as the paper wick that the formulation is wrapped in. These ingredients are bio-degradable and can be composted when the treatment has finished.