The flue brush comes in a variety of fills and dimensions shown as below

Traditional  900mm x 64mm diameter Black coco flue brush for coal ranges and flues. Can be used with warm flues.

Traditional black java flue brush for coal ranges and flues. Can be used with warm flues. Available in 900mm x 112mm and 1070mm x 125mm diameter.

Traditional Black bassine 1070mm x 150mm diameter flue brush for coal ranges and flues. Can be used with warm flues.