1.Thick steel board,3 chains per pontoon 2.high cost performance,quicker move 3.great power final drive, ... etc. We produce amphibious excavator from 15-65 Ton.The JY series pontoon we produced can be fit to the upper ... Paint√Reinforced Heavy Duty Bottom√Steel Materails of Track Rollers√ JY-240 Steel Pontoon for amphibious excavator,swamp excavator,pontoon excavator ...