9.0 mm (3/8") wide Heavy Biker Tungsten Necklace (TUC 001 BIP) - 18", 20” 22”, 24" & 30" 20" weights about 220 grams 22” weights about 230 grams 24" weights about 260 grams Solid Tungsten Carbide, cobalt free. NEVER SCRATCH and Corrosion Resistance. The only way to scratch tungsten is with diamonds. Tungsten is the only rare and exotic metal that can be permanently polished. Hypoallergenic Black IP Mirror-Polish Finished / Secured Lobster Lock! Great for gift! USA buyers. For your protection, International buyer, please insured for USPS First Class Mail Package shipment. We are located in Los Angeles , California and we ship FAST! We provide 30 days no-question asked return guarantee! Please select your correct size - 18”, 20”, 22", 24”, 26", 28" or 30".