Collar with dog tag. Children love to wear dog tags. You can engrave these dog tag chain necklaces to personalize them. A great accessory during military-themed birthday parties or to complete your Halloween costume, each necklace includes a 2 '' metal tag on a 29.9 '' lead-free chain.Our children's necklace items contain breakage characteristics, accessories, or materials required by the Consumer Product Safety Commission's children's jewelry standard.