Replace your ribbed wobble rollers with this thermal-plasticized rubber ribbed roller kit. Non-marking, thermal-plasticized rubber is stronger and more resilient than black rubber. Rollers fit 1-1/8" shaft. Kit includes four 5" x 3" ribbed rollers with polypropylene hub, four Delrin bushings for 3/4" shaft, four 1-1/8" washers, four 3/4" washers and four retainer rings.