✅Compatibility: Compatible with All iRobot Roomba 500, 510, 520, 521, 530, 531, 532, 533, 534, 535, 536, 537, 540, 541, 545, 550, 551, 552, 555, 560, 561, 562, 563, 564, 565, 566, 570, 571, 572, 573, 577, 580, 581, 585, 587, 589, 590, 595, 599, 606, 610, 611, 612, 614, 615, 616, 618, 619, 620, 621, 625, 627, 630, 635, 637, 640, 643, 645, 650, 651, 652, 655, 660, 665, 667, 670, 671, 675, 676, 677, 680, 681, 685, 690, 691, 692, 693, 694, 695, 696, 697, 698, 760, 761, 770, 780, 790, 801, 805, 850, 860, 870, 877, 880, 890, 891, 895, 960, 961, 980, 981, 985,e5(5150), e5(5134), e6(6198), i1(1152), i1+(1552), i2(2152), i3(3150), i3+(3550), i4(4150), i4+(4552), i5, i5+, i6, i6+(6550), i7(7150), i7+(7550), i8, i8+(8550), j5, j5+, j7(7150), j7+(7550), j8+(8550), j9+. ✅What In Box: 1 x Front Caster Wheel. ✅Maintenance: To keep your robot running at peak performance, the front caster wheel are recommended to be replaced every 12 months. It is easy to be replaced and installed on your robot vacuums. ✅Quality Satisfaction Your satisfaction is our greatest wish. We will provide you with the best quality products and services. If you are not satisfied, please feel free to contact us.