Dyson Big Ball Upper Ball Case Cover that fits on a Dyson CY22 CY23 vacuum cleaner.

Genuine Dyson part

Fits Dyson Models CY22

Serial numbers starting with PP7 PP4 PP5 PP6 PH7 Fits Dyson Models CY23 Serial numbers starting with PJ1

This is the part you need then the wheels break off. 

search for Big ball parts like this

"Big Wand" or "Combination Tool"

Supplying parts to Australia