plastic planetray gear sets 1,material:pom 2,size:different size is ok 3,colour: nature colour 4,Cer:ISO9001 ... plastic planetray gear sets1,material:pom2,size:different size is ok3,colour: nature colour4,Cer:ISO90011):Production machine:most ... ,PVC,PA,PE ,PMMA,Nylon and so on.6):Surface processing technics: Heat treatment, Induction hardening, carbonadoing, Others optional;7): ...