1.Compatible with: All I& Series, includes but is not limited to the following models: i3, i3+, i4, i6, i6+, i7, i7+, i8, i8+, E5, E6, E7, j7, j7+, 7550, 3550, 3150, 5150, 6198, and 7150.Non-: The wheel tires are designed to improve traction on slippery or uneven surfaces, ensuring that the robot can move around smoothly and no slipping.Premium Quality: Made of premium rubber, durable and elastic, smooth running, the wheel will not skid on the floor, make cleaning more efficient.Easy to Assembly: Cut and remove worn rubber tire, place new tire. Easy to replace the front caster wheel, snap in place, no tools requiredIt is recommended that replace the tire tread every 6 to 12 months to optimal performance and the front caster wheel is regularly cleaned.color: Blackmaterial: plasticPackage Contents:2 x Side Brushes2 x Tires1 x Front Wheel Caster1 x Screwdriver1 x Cleaning brushOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.