Medical Black Dog Tag - Black Dog Tag with Silver Medical Symbol Large This IB dog tag is stainless steel and hypoallergenic. Specifications: Engravable on front up to 6 lines depending on font, 15 characters each line 5mm Diameter Opening Bale 1.5"L x 1"W 316L Stainless Steel Hypoallergenic Silver Medical Symbol Placed on Lower Right Part of the Tag Non-Corrosive