Awker-T Drive Wheel Module Pair,Right + Left Wheel for iRobot Roomba 500 600 700 800 900 Series
Brand: Awker-T
Quick and easy replacement for the Roomba 5 6 7 8 9 Series
Package Included:100% Original Pair Drive Wheel Module (Left+Right)
If the bad wheels you need to replace are blue, Please don't worry, the gray is the same as the blue, they are just different colours.