This refill head is compostable. If you already have a washing-up brush or a washing-up pommel at home, it will be very practical to change just the head for those times when you need to scrub*. It screws onto your handle or knob. Designed to reduce kitchen waste, its durable and environmentally friendly. Pure tip: Before composting the refill head, use it to clean the bbq grill. *Does not come with handle or knob.