Citrus Magic bird safe Solid Air Fresheners provide convenient and continuous odor controls, that lasts! Using a unique formula, the solid air fresheners work to absorb odors while the fresh, clean scent fills the air. The 20 oz. solid will provide odor elimination for up to 16 weeks and the scent is light and clean, not overpowering. The convenient packaging allows you to easily tell when it is time to replace.