Men's Solid Sterling Silver Rhodium Plated 4mm Miami Cuban Curb Chain Necklace For best results, we do strongly recommend using a tape measure to check neck size before placing your order. This necklace is made of solid rhodium plated sterling silver and stamped "925". This classic necklace looks great alone or with your favorite pendant. Necklace is 4mm thick and comes in: -18 inch long ( weight: 19.1 gram); -20 inch long (weight: 21.3 gram); -22 inch long (weight: 23.4 gram); -24 inch long (weight: 25.5 gram); -26 inch long (weight: 27.6 gram); -28 inch long (weight: 29.7 gram); - 30 inch long (weight: 31.9 gram); - 36 inch long (weight: 38.3 gram).