Genuine GMC Tire Valve Stem Caps made of durable ABS plastic to set your wheels off. Each cap is chrome plated with the emblem on the top. You want durable plastic and not metal caps for many reasons: No seizing, no affect on tire balancing & no affect on your tire pressure monitoring system (TPMS). The set of 4 caps are clam shell packaged which also makes them perfect for gift giving. Made in USA.