Description: Remove the old tire tread,and clean wheels surface Superglue coated on wheels and tires tread upper Three to five minutes later, the tire tread stuck to the tires If you removed the shell would be better operation Please stand for one day before use Specification: Material:Rubber Size:Approx. 15.5 x 1.5cm/6.10 x 0.59 inch Package Includes: 1 Piece iRobot Wheel Tire Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement