materail is best for:HT250/GG25 or GGG450/QT450.we can manufacture best truck flywheel according to your drawing or sample.special factory and over 8years experience.quality has past the ISO9001:2000 Quality Systerm Certification.inner packing is plastic and the outer packing is carton or according to your request.now our maintruck products contain such as benz,toyota,nissan,isuzu,mitsubish and soon . welcome to contactwith me.