Very Cute Mini Medical charms with many allergies/conditions to choose from. These are made from a strong plastic material. The charm measures approximately .25" in diameter. They are small and make a perfect addition to your existing bracelet or create your own charm bracelet. Great for kids, teens, or even adults. Please see the image with the dime for size comparison. Each charm has a lobster clasp for easy attachment. The clasp will be silver (regardless of photo).