... motor on slot car material: pom size:Module 0.5,12T, 24T moq:5000pcs certification:ISO,SGS small ... pinion gear for DC motor on slot carmaterial: pomsize:Module 0. ... PC,PPS,PVC,PA,PE ,PMMA,Nylon and so on.6):Surface processing technics: Heat treatment, Induction hardening, ... -test Meter, Surface measuring Meter and so on; small pinion gear for DC motor ...