Laundry PLUS System Dryer Cartridge REFILL PACK - 10 ct. Lasts Up To 100 Dryer Cycles - The #1 BEST Fabric Softener and Natural Fragrance Refill For Your Dryer. Natural and Earth Friendly Ingredients. Replaces Liquid Fabric Softener, Dryer Sheets, Wool Dryer Balls and Free Clear Packs. Soften and Add Fragrance to Clothes Naturally Without Allergy Causing Chemicals.