Mabanta a polyurethane a tsamaisanang a entsoe ka thepa ea thermoplastic polyurethane (TPU) / polyurethane (CPU), e nang le khanyetso e phahameng khahlanong le ho khoptjoa, mefuta e fapaneng ea li-cores ho netefatsa hore e ntse e boloka motsamao o motle phetisong, 'me mamello ea tlhahiso e nyane. Phetiso ea lebanta la PU e tsamaisanang e entsoe ka theipi e koetsoeng e nang le meno a arohaneng ka ho lekana holim'a bokaholimo ba selikalikoe se ka hare le li-pulley tse tsamaellanang. Ha ho sisinyeha, meno a lebanta a letlooeng ka li-groove tsa li-pulley ho fetisetsa motsamao le matla, e leng mofuta oa phetiso ea meshing, 'me ka hona e na le melemo e fapaneng ea phetiso ea gear, phetiso ea ketane le phetiso ea lebanta le bataletseng. E ka hlahisoa ka lebanta le bulehileng, lebanta la lesale le kopantsoeng, lebanta la lesale le se nang sekoli ntle le sebopeho.