These are a pack of six dustbags that collect the dust issued from above the pad drive cowling. two are used at a time, one each side of the machine on the BHS5120
As it's light, maximise the saving on postage and buy some of the related parts below, such as the skirt or a box of pads or a new skirt or pad holder.
At the moment, standard postage within Australia is capped at a maximum of $20!