Woodwick Candle Reed Diffuser Refill 4 Oz. - Applewood features a highly concentrated fragrance infused with essential oils and can be used to refill any reed diffuser. Each refill features one 4 oz. bottle of genuine Woodwick fragrance oil and 12 natural espresso reeds. Applewood has complex notes of tart green apple and slightly spicy cinnamon bark make this a unique favorite.