The Laundry Tarts Tumbler Tart Re-Scenting Kit comes in a 15 mL dropper bottle - which will last over 100 dryer cycles! This is to be used only with The Laundry Tarts Tumbler Tart dryer balls or other dryer ball products. For strong scent, use up to 5 dryer balls. Do not exceed 2 or more for cloth diaper use on synthetic materials in case of buildup. Use on low heat to keep your dryer ball lasting longer! Disperse scent as desired for light or strong scent. Phthalate Free and Dioxin Free!