... Aluminum (different grade),metal,brass ,copper3.surface treatment for prototypes painting,anodizing,electroplating,brushed,sandblasting,printing,transpartent,rubber ... digital camara case, DVD/VCD case,MP3/4 case, Coffe oven case, TV case, hair dryer, LED light case, air conditioner case, Rice cooker ... the size and material of the products .For products with special surface treatment,like painting,silk ...