Max Petals - Warfarin Medical Alert ID Stainless Steel Heart Shaped Charm Pendant with Lobster Clasp EASY TO READ. Red medical symbol on front and WARFARIN engraved on back. ATTACHES TO MOST BRACELETS AND NECKLACES. Lobster clasp opening is 2mm. STAYS SHINY AND NEW LOOKING. Medical charm is 7/8 x 7/8 inches Stainless Steel. EMERGENCY PERSONNEL ARE TRAINED TO LOOK FOR A MEDICAL ID TAG IN AN EMERGENCY. They will instantly see that you are taking Warfarin. SATISFACTION GUARANTEED. Click the 'Add to Cart' button.