plastic planetray gear sets 1,material:pom 2,size:different size is ok 3,colour: nature colour 4,Cer:ISO9001 plastic planetray gear sets1 ... , HIPS/MBS, ABS, PC,PPS,PVC,PA,PE ,PMMA,Nylon and so on.6):Surface processing technics: Heat treatment, Induction hardening ... requirement;9):Quality control equipments:Roundness Meter,Projector Meter, Microscope, Gear-test Meter, Surface measuring Meter and so on;