This is a pair of 3M 6001 organic vapour filters for a respirator mask. I bought these two weeks ago at KMS Tools along with a new 3M mask but the mask did not fit properly and I returned it.... the filters were not returnable and they will not fit the mask I am currently using. They have been removed from their original packaging but have never been used. Once I realized the mask would not work for me comfortably I put the filters into a ziplock baggie. These will fit 3M respirator masks. With tax these are about $25 new.... https://www.kmstools.com/3m-6001-organic-vapor-cartridge-2-pack.html