Sneaker Balls Shoe Deodorizer and Freshener Balls help keep your shoes, gym bags, gear bags, lockers, and closets smelling fresh. Sized and shaped to fit in small spaces where other fresheners won't fit, Sneaker Balls are an essential foot care accessory. The balls feature quick-twist action, which opens the vents to release a specially formulated fresh and clean scent. Preserve the freshness and life of your Sneaker Balls by twisting them to close the vents when not in use. Scent lasts up to 90 days depending on use. Sneaker Balls Shoe Deodorizer and Freshener Balls fit in all shoes, from kid through adult, and effectively freshen up athletic shoes, everyday footwear, gym bags, and more. Each ball has a diameter of 1.5 inches.