iRobot Roomba Front Caster Wheel Assembly Replacement PartFits all 500 600 700 Series Roomba ModelsNew genuine iRobot original equipment replacement part.Replaces broken， worn， loose， or missing front wheel caster.Slides in place in seconds with no tools required.Fits Models 500 505 510 521 530 532 534 535 545 550 552 555 560 562 564 570 571 580 581 585 595Fits Models 600 610 620 630 632 650 651 655 660 661Fits Models 700 760 765 770 772 775 776 780 782 785 786 790Single package size:，10X10X10 CMSingle gross weight:，0.02 KG