Lub idler yog casting nrog alkali phenolic resin xuab zeb los yog sodium silicate-bonded san txheej txheem.Nto hardness ncav cuag yam tsawg kawg nkaus HRC48-58 nrog hardness tob ntawm 4-6mm (HRC45), tom qab tshav kub txheej txheem.The idler muaj peev xwm tiv taus siab thiab hnav. tiv taus nyob rau hauv hnyav ua hauj lwm tej yam kev mob.