This black medical bracelet is super simple and LATEX FREE! Bracelet attaches to the Contempo ID with stainless steel lobster clasps. The Contempo ID offered with this rubber ID bracelet is also interchangeable with most of the leather bracelets, all beaded bracelets, as well as the interchangeable medical bracelets. To calculate your bracelet size for this black rubber bracelet, measure your wrist and add 3/4” to 1”.