NON-SLIP DESIGN: The wheel tires are designed with grooves, making it create a great grip and prevent it from slipping. EASY TO INSTALL: the machine but not too tight, easy to take apart and install. (Notice: Please the nubs are aligned with the corresponding notches while replacing.) PREMIUM QUALITY: Made of premium rubber, more soft and flexible than the official tires. Improve cleaning efficiency. COMPATIBILITY: The replacement parts work well with M6(6110,6012,6112,6113), making it replace worn-out tires for cleaning performance. SAVE TIME AND MONEY: The wheel parts repalce worn tires, no need to buy expensive parts, clean efficiently and save your time and money. Colour:black Material:rubber Package Contents: 2 Pair x Wheel Tires 2 x screwdriver Only 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.