CNATTAGS Pet ID Tags Skull Shape, 2 Sizes, 8 Colors, Personalized Premium Aluminum Small: 1.37 inches x 1.18 inches. 3.5cm x 3.0cm. Thickness: .046" (1.17 mm) Large: 1.57 inches x 1.37 inches. 4.5cm x 3.5cm. Thickness: .046" (1.17 mm) LIFETIME WARRANTY Exclusively by CNATTAGS Stainless Steel Split Ring Included TO COMPLETE YOUR PURCHASE: Please Click "CUSTOMIZE NOW"