Imikandara ya polyurethane ikozwe mu bikoresho bya termoplastique polyurethane (TPU) / cast polyurethane (CPU), hamwe no kurwanya cyane abrasion, ubwoko butandukanye bwa cores kugirango irebe ko ikomeza kugenda neza mugukwirakwiza, kandi kwihanganira umusaruro ni bito. Gukwirakwiza umukandara wa pU bigizwe nu menyo yizengurutswe hamwe nizunguruka zingana. Iyo ugenda, amenyo yumukandara hamwe na shobuja ya pulleys kugirango yimure imbaraga nimbaraga, ibyo bikaba ari uburyo bwo kohereza imashini, bityo bikaba bifite ibyiza bitandukanye byo kohereza ibikoresho, guhererekanya urunigi no guhererekanya umukandara. Irashobora kubyazwa umusaruro mukenyero wanyuma, umukandara wimpeta, umukandara utagira impeta udafite intera.