This is the one that I chose, but they do have a lot of different styles.
https://www.amazon.com/gp/aw/d/B00BZA22B4/ref=yo_ii_img?ie=UTF8&psc=1
This looks good too:
http://www.amazon.com/Silicone-Medical-Bracelet-personalized-engraving/dp/B00BZA22B4/ref=sr_1_2?ie=UTF8&qid=1401496544&sr=8-2&keywords=medical+alert+bracelet