When your wheel sleeves wear down after all the fun drifting action, they are easy to replace! Simply loosen the nut in the center of the hub and the six (6) bolts on either side of the green portion of the wheel, then remove the sleeve and replace it with a new one, replace and tighten the nut and bolts, and you're off! These products are sold as a single slick, so be sure to order two if both need replaced!