Our new Boys dog tag is half Titanium and half Stainless Steel in a beautiful interlocking double-male design. It's accented with a clear crystal, and is 1-1/4 inch x 1 inch with an 18" stainless steel ball chain. Titanium is a very lightweight metal with great resistance to acidity so doesn’t change its appearance over time like many other metals, and is hypoallergenic.