Izitsha zethu zamaseli zakhiwe nge-polystyrene ekhanye kakhulu enesisekelo esiyisicaba, esisobala esingeke sihlanekezele futhi siwohloke ngaphansi kwesibonakhulu.Izitsha zamaseli ethu zihlukaniswe ngezinhlobo ezimbili: amamodeli angenayo i-TC kanye ne-TC-treated.