These small laundry scent beads work inside your washing machine, giving your laundry up to 12 weeks of freshness. Before adding clothes, simply shake as many scent beads as desired into the cap, and then toss into the washer drum. Use scent booster beads along with your laundry detergent and fabric softener for long-lasting freshness. Application: Laundry Booster; Applicable Material: Fabric; Chemical Compound: PEG (Perfume Carrier); Fragrances; Methyl Di-T-Butyl Hydroxyhydrocinnamate (Odor Blocker); Colorants; Scent: Fresh.