Awọn idler ti wa ni simẹnti pẹlu alkali phenolic resini iyanrin tabi soda silicate-bonded san ilana.Surface líle Gigun kere HRC48-58 pẹlu líle ijinle laarin 4-6mm (HRC45), lẹhin ooru itọju ilana.The idler ni anfani lati withstand ga ikolu ati wọ. resistance labẹ awọn ipo iṣẹ lile.