1,idler length:190-1800mm 2,idler diameter:60-159mm 3,roller material:uhmwpe,hdpe,steel,nylon 4,seal:labyrinthine seal ... in mining,cement,steel,harbor,etcStandard:GB, ISO Low noise 3-7DBDiameter 60 to 159mm Length 190 to 1, 800mm Bearing ... ,The life time: more than 30000 hours2,Samples for testing are available.3, minimum revoiving resistance4, small maintain work 5, high load ...