The filter is two parts:

1 x Yellow Casing

1 x Blue Foam Insert

You will receive both parts

WE ALWAYS RECOMMEND HAVING ONE AS A SPARE SO WHEN FILTER IS DUE FOR WASHING YOU CAN USE YOUR SPARE FILTER AND THEN WHEN THAT'S DUE FOR WASHING YOU CAN USE YOUR OTHER PREVIOUSLY WASHED ONE, SO YOUR VACUUM IS ALWAYS USE-ABLE WHEN YOU NEED IT AND ARE NOT WAITING FOR FILTERS TO DRY. 

GET A MASSIVE SAVING WHEN YOU BUY 2 AS SEEN IN THE DROP DOWN BOX