... light or music 2. MaterialIron, ABS, speaker, pcb.3.Process / TechniqueStamping4.ColoringFilled with Soft enamel match ... : square, round, or customizedInner component: speaker, battery, PCB, ICSpeaker size: 27mm metal availableBattery size: AG13Battery life: ... screen printing, laser engraving, embossed etc6: Advantage: Nickel free & lead freePacking detailsNet weight: 50g/PCGross weight: 51g/PCPCS ...