Ralyn Shoe Deodorizers remove odors from sneakers and other footwear, plus other odor-producing spots like gym bags and lockers. The small, round design fits in all shoe sizes and tight spaces. Quick twist action releases the specially-formulated odor absorbers. DIRECTIONS: Twist open deodorizer's and place one inside each shoe (or in the space to be deodorized). Close deodorizers when not in use to preserve freshness. Scent lasts up to six months, depending on usage frequency.